Question 1

Most CNS neurons lack centrioles. This observation explains

Accepted Answer

A)  why CNS neurons grow such long axons. 
B)  why CNS neurons cannot regenerate. 
C)  the ability of neurons to generate an action potential. 
D)  the ability of neurons to communicate with each other. 
E)  the ability of neurons to produce a resting potential. 
A)  why CNS neurons grow such long axons. 
B)  why CNS neurons cannot regenerate. 
C)  the ability of neurons to generate an action potential. 
D)  the ability of neurons to communicate with each other. 
E)  the ability of neurons to produce a resting potential.

Question 2

At the normal resting potential of a typical neuron, its Na-K ion exchange pump transports

Accepted Answer

A)  1 intracellular sodium ion for 2 extracellular potassium ions. 
B)  2 intracellular sodium ions for 1 extracellular potassium ion. 
C)  3 intracellular sodium ions for 1 extracellular potassium ion. 
D)  3 intracellular sodium ions for 2 extracellular potassium ions. 
E)  3 extracellular sodium ions for 2 intracellular potassium ions. 
A)  1 intracellular sodium ion for 2 extracellular potassium ions. 
B)  2 intracellular sodium ions for 1 extracellular potassium ion. 
C)  3 intracellular sodium ions for 1 extracellular potassium ion. 
D)  3 intracellular sodium ions for 2 extracellular potassium ions. 
E)  3 extracellular sodium ions for 2 intracellular potassium ions.

Question 3

The tiny gaps between adjacent Schwann cells are called ________.

Accepted Answer

The answer of The tiny gaps between adjacent Schwann cells...

Question 4

The largest and most numerous neuroglia in the CNS that absorb and recycle neurotransmitters are the

Accepted Answer

A)  astrocytes. 
B)  ependymal cells. 
C)  microglia. 
D)  oligodendrocytes. 
E)  none of the above 
A)  astrocytes. 
B)  ependymal cells. 
C)  microglia. 
D)  oligodendrocytes. 
E)  none of the above

Question 5

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

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

Which of the following is not a function of the neuroglia?

Accepted Answer

A)  support 
B)  memory 
C)  secretion of cerebrospinal fluid 
D)  maintenance of blood-brain barrier 
E)  phagocytosis 
A)  support 
B)  memory 
C)  secretion of cerebrospinal fluid 
D)  maintenance of blood-brain barrier 
E)  phagocytosis

Question 9

The myelination of central and peripheral axons occurs rapidly through the first few years of life. How can this developmental process explain the improved motor abilities of infants and toddlers?

Accepted Answer

Without full myelination, information ab

Question 10

The buildup of depolarization when EPSPs arrive in rapid succession is called ________ summation.

Accepted Answer

The answer of The buildup of depolarization when EPSPs arrive...

Question 11

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

Accepted Answer

The answer of ________ monitor the digestive, respiratory, cardiovascular, urinary,...

Question 12

In a(n) ________ neuron, the dendrites and axon are continuous or fused.

Accepted Answer

A)  multipolar 
B)  anaxonic 
C)  unipolar 
D)  bipolar 
E)  none of the above 
A)  multipolar 
B)  anaxonic 
C)  unipolar 
D)  bipolar 
E)  none of the above

Question 13

Figure 11-2 The Nerve Action Potential
Use Figure 11-2 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 14

The axon is connected to the cell body at the

Accepted Answer

A)  telodendria. 
B)  synaptic knobs. 
C)  collaterals. 
D)  axon hillock. 
E)  synapse. 
A)  telodendria. 
B)  synaptic knobs. 
C)  collaterals. 
D)  axon hillock. 
E)  synapse.

Question 15

IPSPs (inhibitory postsynaptic potentials)

Accepted Answer

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

Question 16

________ monitor the internal environment.

Accepted Answer

The answer of ________ monitor the internal environment....

Question 17

In the process of continuous action potential propagation,

Accepted Answer

A)  the action potential is triggered by graded depolarization of the initial segment. 
B)  at threshold, sodium channels begin to open rapidly. 
C)  local currents depolarize the region just adjacent to the active zone. 
D)  all of the above 
E)  none of the above 
A)  the action potential is triggered by graded depolarization of the initial segment. 
B)  at threshold, sodium channels begin to open rapidly. 
C)  local currents depolarize the region just adjacent to the active zone. 
D)  all of the above 
E)  none of the above

Question 18

The presence of ________ dramatically increases the speed at which an action potential moves along an axon.

Accepted Answer

The answer of The presence of ________ dramatically increases the...

Question 19

The following are the main steps in the generation of an action potential.
1) Sodium channels are inactivated.
2) Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization.
3) Sodium channels regain their normal properties.
4) A graded depolarization brings an area of an excitable membrane to threshold.
5) A temporary hyperpolarization occurs.
6) Sodium channel activation occurs.
7) Sodium ions enter the cell and depolarization occurs.
The proper sequence of these events is

Accepted Answer

A)  4, 6, 7, 3, 2, 5, 1. 
B)  4, 6, 7, 1, 2, 3, 5. 
C)  6, 7, 4, 1, 2, 3, 5. 
D)  2, 4, 6, 7, 1, 3, 5. 
E)  4, 2, 5, 6, 7, 3, 1. 
A)  4, 6, 7, 3, 2, 5, 1. 
B)  4, 6, 7, 1, 2, 3, 5. 
C)  6, 7, 4, 1, 2, 3, 5. 
D)  2, 4, 6, 7, 1, 3, 5. 
E)  4, 2, 5, 6, 7, 3, 1.

Question 20

Which of the following does not influence the time necessary for a nerve impulse to be transmitted?

Accepted Answer

A)  length of the axon 
B)  presence or absence of a myelin sheath 
C)  diameter of the axon 
D)  presence or absence of nodes 
E)  whether or not the impulse begins in the CNS 
A)  length of the axon 
B)  presence or absence of a myelin sheath 
C)  diameter of the axon 
D)  presence or absence of nodes 
E)  whether or not the impulse begins in the CNS

Exam 11: Neural Tissue

Most CNS neurons lack centrioles. This observation explains

At the normal resting potential of a typical neuron, its Na-K ion exchange pump transports

The tiny gaps between adjacent Schwann cells are called ________.

The largest and most numerous neuroglia in the CNS that absorb and recycle neurotransmitters are the

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

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.

Which of the following is not a function of the neuroglia?

The myelination of central and peripheral axons occurs rapidly through the first few years of life. How can this developmental process explain the improved motor abilities of infants and toddlers?

The buildup of depolarization when EPSPs arrive in rapid succession is called ________ summation.

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

In a(n) ________ neuron, the dendrites and axon are continuous or fused.

Figure 11-2 The Nerve Action Potential Use Figure 11-2 to answer the following questions: -Which area of the graph shows when membrane potential approaches the potassium equilibrium potential?

The axon is connected to the cell body at the

IPSPs (inhibitory postsynaptic potentials)

________ monitor the internal environment.

In the process of continuous action potential propagation,

The presence of ________ dramatically increases the speed at which an action potential moves along an axon.

Which of the following does not influence the time necessary for a nerve impulse to be transmitted?

An Introduction to Anatomy and Physiology

Chemical Level of Organization

Cellular Level of Organization

Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Skeleton

Articulations

Skeletal Muscle Tissue

The Muscular System

The Spinal Cord, Spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood and Blood Vessels

The Heart and Cardiovascular Function

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

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