Question 1

A neuron fires when

Accepted Answer

A)  Na+ ions move against their concentration gradient spontaneously.
B)  Na+ ions are actively pumped down their concentration gradient.
C)  Na+ ions move down their concentration gradient spontaneously.
D)  Na+ ions are actively pumped against their concentration gradient.E) A) and B)
F) B) and C)

Question 2

The sheet of photoreceptors at the back of the eye is the

Accepted Answer

A)  corneA.
B)  retina.
C)  pupil.
D)  iris.
E)  lens.F) A) and D)
G) A) and B)

Question 3

At the snail-shaped _______________,sound is transduced into nerve impulses.

Accepted Answer

A)  auditory canal
B)  eardrum
C)  auditory nerve
D)  cochlea
E)  oval windowF) A) and C)
G) A) and B)

Question 4

In the section "Investigating Life: The Nerve of Those Clams!",the toxins responsible for most shellfish poisonings are water-soluble,heat and acid-stable,and ordinary cooking methods do not eliminate the toxins.Would you predict saxitoxin to affect myelinated and non-myelinated neurons equally?

Accepted Answer

A)  Yes,because all neurons have Na+ transporters.
B)  No,because saxitoxin will not be able to diffuse through the myelin.
C)  Yes,because saxitoxin works at the synapses of neurons,and thus would be able to access both types of neurons equally.
D)  No,because myelinated neurons have a smaller Na+ gradient,and thus will be more resistant.E) None of the above
F) B) and D)

Question 5

Drugs called selective serotonin reuptake inhibitors (SSRIs) block reuptake of serotonin and are used to treat depression.Which of the following would occur in a patient given a SSRI?

Accepted Answer

A)  Serotonin levels would decrease in the synapse.
B)  Serotonin levels would increase in the synapse.
C)  More serotonin would be released by the neuron.
D)  Less serotonin would be released by the neuron.E) B) and D)
F) B) and C)

Question 6

The layer of the wall of the eye that contains blood vessels that supply nutrients to the sheet of photoreceptors at the back of the eye and becomes the iris at the front of the eye is the

Accepted Answer

A)  sclerA.
B)  retina.
C)  vitreous humor.
D)  aqueous humor.
E)  choroid.F) A) and E)
G) B) and D)

Question 7

Amyotrophic lateral sclerosis,or Lou Gehrig disease,causes muscle weakness and atrophy due to a decrease in stimulation by which types of neurons?

Accepted Answer

A)  motor neurons
B)  sensory neurons
C)  interneurons
D)  motor and sensory neurons
E)  sensory and interneuronsF) A) and E)
G) D) and E)

Question 8

A phenomenon in which sensations become less noticeable with prolonged exposure is called

Accepted Answer

A)  gradient adaptation.
B)  an action potential.
C)  a graded potential.
D)  radiating adaptation.
E)  sensory adaptation.F) A) and E)
G) B) and D)

Question 9

The condition that develops when dopamine levels in the brain are deficient is

Accepted Answer

A)  epilepsy.
B)  insomnia.
C)  Alzheimer disease.
D)  Huntington disease.
E)  Parkinson diseasE.F) C) and D)
G) B) and E)

Question 10

The type of neuron that brings information toward the central nervous system is the

Accepted Answer

A)  synaptic neuron.
B)  interneuron.
C)  motor neuron.
D)  sensory neuron.
E)  neuroglia.F) A) and C)
G) B) and D)

Question 11

The three major roles of the human nervous system are

Accepted Answer

A)  sensory integration,glandular response,and motor response.
B)  seeing,feeling,and hearing.
C)  sensory input,sensory integration,and motor response.
D)  smooth muscle response,cardiac muscle response,and skeletal muscle response.E) C) and D)
F) B) and C)

Question 12

The part of the brain that is responsible for homeostatic control of vital organs is the

Accepted Answer

A)  cerebellum.
B)  hypothalamus.
C)  medulla oblongata.
D)  pons.
E)  cerebrum.F) None of the above
G) All of the above

Question 13

The part of the central nervous system that conducts information to and from the brain is the

Accepted Answer

A)  motor neuron.
B)  spinal cord.
C)  sensory neuron.
D)  brainstem.
E)  medulla oblongata.F) A) and E)
G) A) and D)

Question 14

When you smell the cookies,which of the following is being activated?

Accepted Answer

A)  mechanoreceptor
B)  thermoreceptor
C)  photoreceptor
D)  chemoreceptor
E)  pain receptorF) All of the above
G) C) and E)

Question 15

The part of the brain that regulates essential functions such as breathing,blood pressure,and heart rate is the

Accepted Answer

A)  cerebellum.
B)  hypothalamus.
C)  medulla oblongata.
D)  pons.
E)  cerebrum.F) A) and D)
G) A) and C)

Question 16

Which of the following best describes how a neuron fires?

Accepted Answer

A)  Na+ ions cross the plasma membrane initiating a wave that travels down the axon.
B)  Vesicles carry neurotransmitters from the nucleus to the other end of the neuron.
C)  Na+ ions enter one end of the neuron and diffuse to the other end down the axon.
D)  Neurotransmitters enter one end of the neuron and diffuse to the other end down the axon.
E)  Neurotransmitters cross the plasma membrane creating a wave that travels down the axon.F) A) and C)
G) A) and E)

Question 17

In the section "Investigating Life: The Nerve of Those Clams!",which of the following neurons would you predict to be sensitive to saxitoxin?

Accepted Answer

A)  All neurons would be sensitive.
B)  sensory neurons
C)  interneurons
D)  motor neuronsE) A) and D)
F) A) and C)

Question 18

Which of the following is not one of the general senses?

Accepted Answer

A)  touch
B)  temperature
C)  pain
D)  vision
E)  positionF) A) and C)
G) B) and E)

Question 19

A neural impulse usually begins at the gaps in the myelin sheath along the axon.

Accepted Answer

A) True 
 B)False

Question 20

Odorous molecules are first detected in the nose,are transduced and travel to the olfactory bulb and then to the cerebral cortex.

Accepted Answer

A) True 
 B)False

Exam 24: Nervous System and the Senses

The part of the central nervous system that conducts information to and from the brain is the

Correct AnswerverifiedShow Answer

When you smell the cookies,which of the following is being activated?

Correct AnswerverifiedShow Answer

The three major roles of the human nervous system are

Correct AnswerverifiedShow Answer

A neuron fires when

Correct AnswerverifiedShow Answer

Amyotrophic lateral sclerosis,or Lou Gehrig disease,causes muscle weakness and atrophy due to a decrease in stimulation by which types of neurons?

Correct AnswerverifiedShow Answer

The sheet of photoreceptors at the back of the eye is the

Correct AnswerverifiedShow Answer

In the section "Investigating Life: The Nerve of Those Clams!",which of the following neurons would you predict to be sensitive to saxitoxin?

Correct AnswerverifiedShow Answer

The type of neuron that brings information toward the central nervous system is the

Correct AnswerverifiedShow Answer

The part of the brain that regulates essential functions such as breathing,blood pressure,and heart rate is the

Correct AnswerverifiedShow Answer

At the snail-shaped _______________,sound is transduced into nerve impulses.

Correct AnswerverifiedShow Answer

A phenomenon in which sensations become less noticeable with prolonged exposure is called

Correct AnswerverifiedShow Answer

Which of the following is not one of the general senses?

Correct AnswerverifiedShow Answer

Drugs called selective serotonin reuptake inhibitors (SSRIs) block reuptake of serotonin and are used to treat depression.Which of the following would occur in a patient given a SSRI?

Correct AnswerverifiedShow Answer

The condition that develops when dopamine levels in the brain are deficient is

Correct AnswerverifiedShow Answer

The layer of the wall of the eye that contains blood vessels that supply nutrients to the sheet of photoreceptors at the back of the eye and becomes the iris at the front of the eye is the

Correct AnswerverifiedShow Answer

Odorous molecules are first detected in the nose,are transduced and travel to the olfactory bulb and then to the cerebral cortex.

Correct AnswerverifiedShow Answer

A neural impulse usually begins at the gaps in the myelin sheath along the axon.

Correct AnswerverifiedShow Answer

Which of the following best describes how a neuron fires?

Correct AnswerverifiedShow Answer

In the section "Investigating Life: The Nerve of Those Clams!",the toxins responsible for most shellfish poisonings are water-soluble,heat and acid-stable,and ordinary cooking methods do not eliminate the toxins.Would you predict saxitoxin to affect myelinated and non-myelinated neurons equally?

Correct AnswerverifiedShow Answer

The part of the brain that is responsible for homeostatic control of vital organs is the

Correct AnswerverifiedShow Answer

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