Question 1

Neurons that have one axon and one dendrite,with the soma in between,are called

Accepted Answer

A) anaxonic. 
B) unipolar. 
C) bipolar. 
D) tripolar. 
E) multipolar. 
A) anaxonic. 
B) unipolar. 
C) bipolar. 
D) tripolar. 
E) multipolar.

Question 2

Figure 12-1 The Neuron
Use Figure 12-1 to answer the following questions:
-What is contained inside the structure labeled "5"?

Accepted Answer

A) neuroglia 
B) sodium ions 
C) acetylcholinesterase 
D) calcium ions 
E) neurotransmitter molecules 
A) neuroglia 
B) sodium ions 
C) acetylcholinesterase 
D) calcium ions 
E) neurotransmitter molecules

Question 3

A postsynaptic neuron will have an excitatory postsynaptic potential (EPSP)when

Accepted Answer

A) chemically regulated potassium channels are open and potassium is diffusing out of the cell. 
B) more calcium ions than usual diffuse into the neuron. 
C) chemically regulated sodium channels are open and sodium is diffusing into the cell. 
D) the neuron is hyperpolarized. 
E) more potassium ions than usual diffuse out of the neuron. 
A) chemically regulated potassium channels are open and potassium is diffusing out of the cell. 
B) more calcium ions than usual diffuse into the neuron. 
C) chemically regulated sodium channels are open and sodium is diffusing into the cell. 
D) the neuron is hyperpolarized. 
E) more potassium ions than usual diffuse out of the neuron.

Question 4

________ monitor the digestive,respiratory,cardiovascular,urinary,and reproductive systems.

Accepted Answer

A) Spinal nerves 
B) Unipolar neurons 
C) Internoceptors 
D) Exteroceptors 
E) Proprioceptors 
A) Spinal nerves 
B) Unipolar neurons 
C) Internoceptors 
D) Exteroceptors 
E) Proprioceptors

Question 5

The minimum stimulus required to trigger an action potential is known as the

Accepted Answer

A) threshold. 
B) all-or-none response. 
C) potential. 
D) incentive. 
E) summation. 
A) threshold. 
B) all-or-none response. 
C) potential. 
D) incentive. 
E) summation.

Question 6

The site in the neuron where EPSPs and IPSPs are integrated is the

Accepted Answer

A) chemical synapse. 
B) electrical synapse. 
C) axon hillock. 
D) dendritic membrane. 
E) synaptic terminal. 
A) chemical synapse. 
B) electrical synapse. 
C) axon hillock. 
D) dendritic membrane. 
E) synaptic terminal.

Question 7

Deteriorating changes in the distal segment of an axon as a result of a break between it and the soma is called ________ degeneration.

Accepted Answer

A) neural 
B) central 
C) peripheral 
D) Wallerian 
E) conduction 
A) neural 
B) central 
C) peripheral 
D) Wallerian 
E) conduction

Question 8

Puffer fish poison blocks voltage-gated sodium channels like a cork.What effect would this neurotoxin have on the function of neurons?

Accepted Answer

A) Neurons would depolarize more rapidly. 
B) Action potentials would lack a repolarization phase. 
C) The absolute refractory period would be shorter than normal. 
D) The axon would be unable to generate action potentials. 
E) None,because the chemically gated sodium channels would still function. 
A) Neurons would depolarize more rapidly. 
B) Action potentials would lack a repolarization phase. 
C) The absolute refractory period would be shorter than normal. 
D) The axon would be unable to generate action potentials. 
E) None,because the chemically gated sodium channels would still function.

Question 9

The tiny gaps between adjacent Schwann cells are called

Accepted Answer

A) neurillema. 
B) nodes of Ranvier. 
C) axolemma. 
D) terminals. 
E) vesicles. 
A) neurillema. 
B) nodes of Ranvier. 
C) axolemma. 
D) terminals. 
E) vesicles.

Question 10

Figure 12-2 The Nerve Action Potential
Use Figure 12-2 to answer the following questions:
-When is the neuron in the refractory period?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 11

The most abundant class of neuron in the central nervous system is

Accepted Answer

A) anaxonic. 
B) bipolar. 
C) multipolar. 
D) pseudopolar. 
E) unipolar. 
A) anaxonic. 
B) bipolar. 
C) multipolar. 
D) pseudopolar. 
E) unipolar.

Question 12

A neuron that receives neurotransmitter from another neuron is called

Accepted Answer

A) the presynaptic neuron. 
B) the motor neuron. 
C) an oligodendrocyte. 
D) a satellite cell. 
E) the postsynaptic neuron. 
A) the presynaptic neuron. 
B) the motor neuron. 
C) an oligodendrocyte. 
D) a satellite cell. 
E) the postsynaptic neuron.

Question 13

Branches that may occur along an axon are called

Accepted Answer

A) telodendria. 
B) synaptic terminals. 
C) collaterals. 
D) hillocks. 
E) synapses. 
A) telodendria. 
B) synaptic terminals. 
C) collaterals. 
D) hillocks. 
E) synapses.

Question 14

The part of the peripheral nervous system that carries sensory information to the CNS is designated

Accepted Answer

A) motor. 
B) afferent. 
C) efferent. 
D) autonomic. 
E) somatic. 
A) motor. 
B) afferent. 
C) efferent. 
D) autonomic. 
E) somatic.

Question 15

If the chemically gated sodium channels in the postsynaptic membrane were completely blocked,

Accepted Answer

A) synaptic transmission would fail. 
B) release of neurotransmitter would stop. 
C) smaller action potentials would result. 
D) the presynaptic membrane would be unable to reach threshold. 
E) the presynaptic neuron would release a different neurotransmitter. 
A) synaptic transmission would fail. 
B) release of neurotransmitter would stop. 
C) smaller action potentials would result. 
D) the presynaptic membrane would be unable to reach threshold. 
E) the presynaptic neuron would release a different neurotransmitter.

Question 16

Neuron cell bodies in the PNS are clustered together in masses called

Accepted Answer

A) fibers. 
B) tracts. 
C) nerves. 
D) nuclei. 
E) ganglia. 
A) fibers. 
B) tracts. 
C) nerves. 
D) nuclei. 
E) ganglia.

Question 17

A stimulus that changes a postsynaptic neuron's membrane from resting potential to -85 mV is a(n)________ stimulus.

Accepted Answer

A) excitatory 
B) depolarizing 
C) temporal 
D) saltatory 
E) inhibitory 
A) excitatory 
B) depolarizing 
C) temporal 
D) saltatory 
E) inhibitory

Question 18

Axons terminate in a series of fine extensions known as

Accepted Answer

A) telodendria. 
B) terminals. 
C) collaterals. 
D) dendrites. 
E) synapses. 
A) telodendria. 
B) terminals. 
C) collaterals. 
D) dendrites. 
E) synapses.

Question 19

Figure 12-2 The Nerve Action Potential
Use Figure 12-2 to answer the following questions:
-Which area of the graph shows when membrane potential approaches the potassium equilibrium potential?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 20

IPSPs (inhibitory postsynaptic potentials)

Accepted Answer

A) are local depolarizations. 
B) are local hyperpolarizations. 
C) increase membrane permeability to sodium ions. 
D) block the efflux of potassium ions. 
E) block the efflux of calcium ions. 
A) are local depolarizations. 
B) are local hyperpolarizations. 
C) increase membrane permeability to sodium ions. 
D) block the efflux of potassium ions. 
E) block the efflux of calcium ions.

Exam 12: Neural Tissue

Neurons that have one axon and one dendrite,with the soma in between,are called

Figure 12-1 The Neuron Use Figure 12-1 to answer the following questions: -What is contained inside the structure labeled "5"?

A postsynaptic neuron will have an excitatory postsynaptic potential (EPSP)when

________ monitor the digestive,respiratory,cardiovascular,urinary,and reproductive systems.

The minimum stimulus required to trigger an action potential is known as the

The site in the neuron where EPSPs and IPSPs are integrated is the

Deteriorating changes in the distal segment of an axon as a result of a break between it and the soma is called ________ degeneration.

Puffer fish poison blocks voltage-gated sodium channels like a cork.What effect would this neurotoxin have on the function of neurons?

The tiny gaps between adjacent Schwann cells are called

Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?

The most abundant class of neuron in the central nervous system is

A neuron that receives neurotransmitter from another neuron is called

Branches that may occur along an axon are called

The part of the peripheral nervous system that carries sensory information to the CNS is designated

If the chemically gated sodium channels in the postsynaptic membrane were completely blocked,

Neuron cell bodies in the PNS are clustered together in masses called

A stimulus that changes a postsynaptic neuron's membrane from resting potential to -85 mV is a(n)________ stimulus.

Axons terminate in a series of fine extensions known as

Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -Which area of the graph shows when membrane potential approaches the potassium equilibrium potential?

IPSPs (inhibitory postsynaptic potentials)

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

Muscle Tissue

The Muscular System

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

Fluid, electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

Filters

$Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?$ Figure 12-2 The Nerve Action Potential Use Figure 12-2 to answer the following questions: -When is the neuron in the refractory period?