Q: Which equation best represents the function of the sodium-potassium pump in restoring ionic conditions after an action potential?

$$3\ \mathrm{Na}^+\ \text{out} : 2\ \mathrm{K}^+\ \text{in}$$

Question 1

Which of the following best describes the primary function of the nervous system?

Accepted Answer

To control and communicate rapidly and specifically via electrical and chemical signals

Question 2

A patient suffers damage to the myelin sheath in the CNS. Which neuroglial cell type is most likely affected?

Accepted Answer

Oligodendrocytes

Question 3

Which of the following statements about action potentials is TRUE?

Accepted Answer

Action potentials are all-or-none events and always have the same amplitude

Question 4

What is the main difference between white matter and gray matter in the CNS?

Accepted Answer

White matter contains dense collections of myelinated fibers, while gray matter contains mostly neuron cell bodies and nonmyelinated fibers

Question 5

Which equation correctly represents the resting membrane potential of a neuron?

Accepted Answer

$$V_{rest} \approx -70\ \mathrm{mV}$$

Question 6

During which phase of the action potential do voltage-gated sodium channels open, causing rapid depolarization?

Accepted Answer

Depolarization

Question 7

A neuron receives a stimulus that causes the inside of the membrane to become more negative than the resting membrane potential. What is this process called?

Accepted Answer

Hyperpolarization

Question 8

Which type of neuroglia acts as the main defense cell in the CNS, monitoring neuron health and removing debris?

Accepted Answer

Microglial cells

Question 9

Which of the following best explains why myelinated axons conduct impulses faster than unmyelinated axons?

Accepted Answer

Myelinated axons use saltatory conduction, allowing impulses to jump between nodes of Ranvier

Question 10

Which neurotransmitter is released at neuromuscular junctions and degraded by acetylcholinesterase?

Accepted Answer

Acetylcholine (ACh)

Question 11

A patient presents with muscle weakness and slow reflexes. Laboratory tests reveal damage to Schwann cells. Which part of the nervous system is most affected?

Accepted Answer

Peripheral nervous system (PNS)

Question 12

Which of the following is TRUE regarding graded potentials?

Accepted Answer

They vary in amplitude depending on stimulus strength and operate over short distances

Question 13

Which of the following correctly matches the neuron type with its function?

Accepted Answer

Interneurons shuttle signals between sensory and motor neurons within the CNS

Question 14

Which equation best represents the function of the sodium-potassium pump in restoring ionic conditions after an action potential?

Accepted Answer

$$3\ \mathrm{Na}^+\ 	ext{out} : 2\ \mathrm{K}^+\ 	ext{in}$$

Question 15

Which of the following is a direct (channel-linked) neurotransmitter receptor?

Accepted Answer

Channel-linked receptor

Question 16

A patient is exposed to a toxin that blocks voltage-gated potassium channels. What effect would this have on the action potential?

Accepted Answer

Repolarization would be slowed or inhibited

Question 17

Which of the following best describes the absolute refractory period?

Accepted Answer

A period when voltage-gated Na$$^+$$ channels are open and the neuron cannot respond to another stimulus

Question 18

Which pattern of neural processing is responsible for rapid, automatic responses to stimuli, such as the knee-jerk reflex?

Accepted Answer

Serial processing

Question 19

Which neurotransmitter acts as a natural opiate, reducing pain perception?

Accepted Answer

Endorphins

Question 20

A patient has a mutation that prevents the formation of gap junctions between neurons. Which type of synapse would be most affected?

Accepted Answer

Electrical synapse

The Nervous System: Structure, Function, and Neural Communication

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