True/False Indicate whether the
statement is true or false.
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1.
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The elongated extension of a neuron that conducts nerve impulses is called an
axon.
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2.
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The cells of the nervous system that conduct electrical signals are called nerve
cells, or neurons.
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3.
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Many neurons have a layer of insulation called a myelin sheath that wraps around
the axon.
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4.
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Myelin sheaths slow down nerve impulses.
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5.
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The potential of a resting neuron is positive.
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6.
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When a neuron is not conducting a nerve impulse, the neuron is said to be at
rest.
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7.
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Neurons communicate with other cells by using neurotransmitters at
synapses.
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8.
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Neurotransmitters are chemical messengers that carry nerve impulses across the
synaptic cleft.
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9.
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A neurotransmitter may either excite or inhibit the cell it stimulates.
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10.
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The peripheral nervous system carries all the messages back and forth between
the central nervous system and the rest of the body.
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11.
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The spinal cord and the brain make up the peripheral nervous system.
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12.
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Motor neurons that conduct impulses to skeletal muscles under our conscious
control make up the limbic system.
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13.
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Most of the activity of the cerebrum occurs in the cerebral cortex.
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14.
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The spinal cord is a dense cable of nervous tissue that runs through the
vertebral column.
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15.
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The spinal cord links the brain to the central nervous system (CNS).
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16.
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Some activity in the somatic nervous system, such as spinal reflexes, is
involuntary.
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17.
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A spinal reflex is a self-protective motor response.
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18.
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Spinal reflexes are usually slow because they involve the spinal cord and the
peripheral nervous system.
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19.
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The peripheral motor neurons that regulate smooth muscles are part of the
autonomic nervous system.
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20.
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Emotions are controlled by the sympathetic division of the autonomic nervous
system.
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21.
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The sympathetic division decreases blood pressure, heart rate, and breathing
rate.
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22.
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Pain receptors are located throughout all tissues and organs except the
brain.
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23.
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Most of the pain receptors in the body are located in the brain.
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24.
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Processing sites for sensory systems tend to be localized in specific regions of
the cerebrum.
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25.
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Rods are receptor cells that respond to bright light.
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26.
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Most visual processing takes place in the temporal lobe.
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27.
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Your ears help you maintain your balance.
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28.
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We hear by detecting vibrations in the ground.
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29.
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Taste buds located in the tongue are stimulated when a chemical dissolved in
saliva binds to taste cells in the taste buds.
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30.
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Chemicals in the air stimulate olfactory receptors.
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31.
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The sense of smell affects the enjoyment of food.
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32.
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Cocaine acts by causing dopamine reuptake.
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33.
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Addiction to psychoactive drugs is a physiological response because addiction
involves interactions of drug molecules with neurons and synapses.
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34.
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Enkephalins are natural pain relievers released by the body in response to pain
and stress.
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35.
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Narcotics mimic the action of enkephalins.
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36.
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Alcohol is able to change the structure of a neuron’s membrane, changing
the shape of receptor proteins.
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37.
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Nicotine mimics the action of the neurotransmitter acetylcholine.
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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38.
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“Antennae” that extend from a neuron and that receive information
from other cells are called
a. | axons. | c. | synapses. | b. | cell bodies. | d. | dendrites. |
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39.
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Nodes of Ranvier
a. | strengthen axons. | c. | occur in malfunctioning axons. | b. | slow nerve
impulses. | d. | are gaps in the
myelin sheath. |
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40.
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The myelin sheath
a. | transmits impulses from one neuron to another. | b. | insulates
synapses. | c. | nourishes neurons. | d. | insulates
axons. |
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41.
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unmyelinated axon : slow nerve impulses ::
a. | neuron : being composed of many axons | b. | nerve impulse : not traveling through
axons | c. | myelinated axon : fast nerve impulses | d. | dendrite : sending
information |
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42.
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synapse : two neurons ::
a. | neuron : two cell bodies | c. | synapse : cell body and
axon | b. | cell body : two axons | d. | axon : cell body and synapse |
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43.
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Which of the following statements about the resting potential of a neuron is
true?
a. | There are many times more sodium ions outside the neuron than
inside. | b. | Sodium ions are in balance inside and outside the neuron. | c. | There are fewer
potassium ions inside the neuron than outside. | d. | There are equal amounts of potassium and sodium
ions inside and outside the neuron. |
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44.
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After an action potential, the sodium-potassium pump helps
a. | rebuild axon fibers. | c. | cause a stimulus. | b. | restore the resting
potential. | d. | All of the
above |
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45.
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When a neuron is at rest,
a. | sodium ions are most concentrated inside the cell. | b. | potassium ions are
most concentrated inside the cell. | c. | the outside of the cell is negatively
charged. | d. | All of the above |
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46.
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A nerve impulse
a. | moves from the inside to the outside of an axon. | b. | moves from the
outside to the inside of an axon. | c. | is the movement of an action potential along an
axon. | d. | moves slowly. |
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47.
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When an impulse moves down the axon,
a. | sodium ions first rush out of the cell. | b. | a small part of the
axon momentarily reverses its polarity. | c. | the resting potential of the cell does not
change. | d. | potassium ions are pumped into the axon. |
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48.
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Neurotransmitters are
a. | electrical impulses. | b. | found only in neurons with myelin
sheaths. | c. | released at synapses. | d. | produced by
muscles. |
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49.
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When neurotransmitters cross a synapse and open ion channels in the membrane of
a postsynaptic neuron, which of the following happens?
a. | inhibition of impulses in the neuron | c. | initiation of an impulse in the
neuron | b. | the death of the neuron | d. | Both (a) and (c) |
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50.
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When a neurotransmitter is released from a presynaptic neuron, the
neurotransmitter may
a. | become an enzyme in the space between the neurons. | b. | bind to membrane
receptor proteins on the membrane of the postsynaptic neuron. | c. | cover the membrane
of the axon. | d. | cause the cell body of the postsynaptic neuron to
enlarge. |
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51.
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Refer to the illustration above. If neurotransmitters could not be cleared out
of a synapse after transmitting a message,
a. | a postsynaptic neuron would continue to be stimulated for an indefinite period of
time. | b. | the presynaptic neuron could not pass on its impulse. | c. | the postsynaptic
neuron would not be stimulated. | d. | None of the
above |
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52.
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Refer to the illustration above. Label B indicates a
a. | neurotransmitter molecule. | c. | receptor
protein. | b. | neuromodulator molecule. | d. | drug molecule. |
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53.
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Refer to the illustration above. Which labeled object in the diagram would be
responsible for removing neurotransmitters from the synaptic cleft?
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54.
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Refer to the illustration above. The effect of the neurotransmitter might be
prolonged by the presence of molecule
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55.
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Refer to the illustration above. When a drug blocks removal of a
neurotransmitter from a synaptic cleft for a prolonged period,
a. | the postsynaptic neuron is overstimulated. | b. | the number of
receptors on the postsynaptic neuron decreases. | c. | the only way to maintain normal functioning of
the nerve pathway is to continue taking the drug. | d. | All of the
above |
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56.
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The central nervous system consists of
a. | the brain and spinal cord. | c. | the spinal cord
only. | b. | spinal nerves only. | d. | the brain only. |
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57.
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The peripheral nervous system
a. | is not linked to the central nervous system. | b. | provides pathways to
and from the central nervous system. | c. | consists of the cerebellum and spinal
cord. | d. | is composed of only motor neurons. |
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58.
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Information is carried from the central nervous system to a muscle or gland
by
a. | sensory neurons. | c. | motor neurons. | b. | sensory receptors. | d. | None of the
above |
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59.
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Motor neurons transmit messages
a. | to the brain. | b. | to the spinal cord. | c. | from the spinal cord
to the brain. | d. | from the central nervous system to a muscle or gland. |
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60.
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Refer to the illustration above. Structure B in the diagram is the
a. | spinal cord. | c. | cerebellum. | b. | brain stem. | d. | cerebrum. |
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61.
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Refer to the illustration above. Hunger and thirst are regulated by
structure
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62.
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Refer to the illustration above. The cerebrum is labeled
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63.
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Sensory neurons transmit messages
a. | from the central nervous system to a muscle or gland. | b. | from the brain to
the spinal cord. | c. | to the spinal cord or brain. | d. | All of the
above |
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64.
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Gray matter consists of
a. | cell bodies of neurons. | c. | myelin. | b. | only
synapses. | d. | axons. |
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65.
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The spinal cord is linked to the peripheral nervous system through
a. | spinal nerves | c. | interneurons | b. | the thalamus | d. | All of the
above |
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66.
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A reflex
a. | is a sudden, involuntary movement of | b. | is not under conscious
control. | c. | is not learned.muscles in response to a stimulus. | d. | All of the
above |
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67.
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When the ligament below the patella is tapped, the quadriceps contracts, the
hamstrings relax, and the leg rapidly
a. | contracts | c. | extends | b. | relaxes | d. | None of the
above |
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68.
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The autonomic nervous system controls
a. | reflexes. | b. | voluntary movement. | c. | involuntary
functions of the internal organs. | d. | locomotion. |
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69.
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The division of the autonomic nervous system that keeps you breathing when you
fall asleep is the ____ division.
a. | somatic | c. | sympathetic | b. | central | d. | parasympathetic |
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70.
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Which of these is not a lobe of the brain?
a. | occipital | c. | auditory | b. | parietal | d. | temporal |
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71.
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How many lobes are there in the brain?
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72.
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The layer of photoreceptors and neurons at the back of the eye is called
the
a. | retina. | c. | iris. | b. | cochlea. | d. | optic nerve. |
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73.
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Dim-light vision is detected by the
a. | cones. | c. | cornea. | b. | lens. | d. | rods. |
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74.
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Sensory receptors essential for balance are located in the
a. | eyes. | c. | cochlea of the inner ear. | b. | eardrum. | d. | semicircular canals. |
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75.
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Hair cells in the semicircular canals detect
a. | motion of the head. | c. | light. | b. | loudness. | d. | sounds. |
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76.
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Ears
a. | function to detect sounds. | c. | detect only internal
stimuli. | b. | help maintain your balance. | d. | Both (a) and (b) |
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77.
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Specialized receptors that enable hearing are found in the
a. | cornea. | c. | cochlea. | b. | semicircular canals. | d. | cerebellum. |
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78.
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When we hear,
a. | sound waves enter the ear canal and strike the eardrum. | b. | the membrane in the
cochlea moves. | c. | the auditory nerve carries nerve impulses to the brain. | d. | All of the
above |
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79.
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Chemoreceptors that detect odors are called ____ receptors.
a. | auditory | c. | cone | b. | olfactory | d. | cochlea |
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80.
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Psychoactive drugs, such as cocaine,
a. | affect the central nervous system by changing the activity of
synapses. | b. | are usually not addictive. | c. | include only illegal drugs. | d. | All of the
above |
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81.
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Cocaine acts by
a. | preventing dopamine reuptake. | b. | affecting the limbic system, causing
euphoria. | c. | overstimulating postsynaptic neurons. | d. | All of the
above |
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82.
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Narcotics affect the nervous system’s control of pain perception by
a. | blocking dopamine reabsorption. | c. | inhibiting dopamine
production. | b. | mimicking cocaine. | d. | mimicking enkephalins. |
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83.
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Nicotine in tobacco causes pleasurable feelings by
a. | blocking dopamine reabsorption. | b. | mimicking the action of
acetylcholine. | c. | inhibiting a neurotransmitter similar to dopamine. | d. | mimicking
enkephalins. |
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84.
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The effects of alcohol on the human body include
a. | changes to the cell membrane of nerve cells. | b. | altered transmission
of nerve signals. | c. | impaired coordination. | d. | All of the
above |
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Completion Complete each
statement.
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85.
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A(n) ____________________ is a cell that conducts electrical signals.
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86.
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Cytoplasmic extensions called ____________________ allow a neuron to receive
information simultaneously from many different sources.
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87.
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Some axons are surrounded by an insulating structure called a(n)
____________________ ____________________.
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88.
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The electrical charge across the membrane of a neuron is caused primarily by
different concentrations of ____________________ and ____________________ ions inside and outside the
cell.
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89.
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Messages are carried across synapses by signal molecules called
____________________.
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90.
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The junction of a neuron with another cell is called a(n)
____________________.
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91.
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The part of the nervous system that does not include the spinal cord and brain
is known as the ____________________ nervous system.
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92.
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Nerves that control breathing, swallowing, heartbeat, and the diameter of the
blood vessels are found in the ____________________ ____________________.
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93.
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The thalamus, hypothalamus, and cells deep within the cerebral cortex of the
brain make up the ____________________ system, which helps regulate emotions.
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94.
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A sudden, involuntary movement in response to a stimulus is called a(n)
____________________.
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95.
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The ____________________ division of the autonomic nervous system regulates
involuntary functions during routine conditions.
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96.
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The two divisions of the autonomic nervous system are the parasympathetic
division and the ____________________ division.
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97.
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Sensory receptors that respond to tissue damage are called ____________________
receptors.
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98.
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Specialized neurons that detect sensory stimuli are called ____________________
receptors.
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99.
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Sensory neurons leading from each sense organ to the brain come together at a
common region in the ____________________ ____________________.
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100.
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The ____________________ is the light-sensing portion of the eye.
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101.
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When light enters the eye, it activates photoreceptors called
____________________ and ____________________.
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102.
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When light enters the eye, it first passes through the
____________________.
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103.
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Auditory processing takes place in the ____________________ lobe of the
brain.
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104.
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The ____________________ is a small, snail-shaped structure of the inner ear
lined with hair cells.
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105.
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The specialized sensory receptors found in the cochlea are called
____________________ cells.
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106.
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Olfactory receptors are located in the roof of the ____________________
passage.
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107.
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A(n) ____________________ ____________________ is a globular cluster of cells
specialized to detect the four basic types of chemicals found in foods.
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108.
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Psychoactive drugs that decrease the activity of the central nervous system are
called ____________________.
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109.
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Exposure to large amounts of a psychoactive drug over a prolonged period of time
may cause a change in the functioning of synapses. The result of such exposure is called
____________________.
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110.
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Neurotransmitters released by the human body in response to pain are called
____________________.
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