Q: Which equation best represents the Nernst equation for calculating the equilibrium potential for a single ion?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right)$$

Question 1

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

Accepted Answer

To coordinate and integrate the activities of all body systems by detecting changes, interpreting them, and responding appropriately

Question 2

Which structure is responsible for the rapid transmission of electrical signals along a neuron?

Accepted Answer

Axon

Question 3

Which of the following is a major difference between the somatic and autonomic divisions of the peripheral nervous system?

Accepted Answer

The somatic division controls voluntary skeletal muscles, while the autonomic division controls involuntary smooth and cardiac muscles.

Question 4

Which neuroglial cell is responsible for forming the myelin sheath in the central nervous system (CNS)?

Accepted Answer

Oligodendrocyte

Question 5

A patient presents with slowed nerve conduction velocity. Which of the following is most likely affected?

Accepted Answer

The presence of myelin on the axon

Question 6

Which equation best represents the Nernst equation for calculating the equilibrium potential for a single ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Question 7

During which period can a neuron generate another action potential only if a stronger-than-normal stimulus is applied?

Accepted Answer

Relative refractory period

Question 8

Which of the following best explains why saltatory conduction is faster than continuous conduction?

Accepted Answer

Saltatory conduction allows the action potential to jump from one node of Ranvier to the next, reducing the number of action potentials that must be generated.

Question 9

Which of the following is a key structural difference between multipolar and unipolar neurons?

Accepted Answer

Multipolar neurons have one axon and multiple dendrites, while unipolar neurons have a single process that splits into two branches.

Question 10

Which of the following best describes the role of astrocytes in the CNS?

Accepted Answer

They maintain the blood-brain barrier and regulate the extracellular environment.

Question 11

Which of the following is true regarding chemical synapses?

Accepted Answer

They involve the release of neurotransmitters from the presynaptic neuron into the synaptic cleft.

Question 12

A neurotransmitter binds to its receptor and causes an influx of $$	ext{Na}^+$$ ions into the postsynaptic cell. What is the most likely result?

Accepted Answer

An excitatory postsynaptic potential (EPSP)

Question 13

Which of the following best explains why acetylcholine can be excitatory at one synapse and inhibitory at another?

Accepted Answer

The effect of acetylcholine depends on the type of receptor present on the postsynaptic cell.

Question 14

Which of the following is the most common inhibitory neurotransmitter in the central nervous system?

Accepted Answer

Gamma-aminobutyric acid (GABA)

Question 15

A patient is diagnosed with multiple sclerosis, a disease that destroys myelin in the CNS. Which neuroglial cell is primarily affected?

Accepted Answer

Oligodendrocyte

Question 16

Which of the following best describes the sequence of events in chemical synaptic transmission?

Accepted Answer

Action potential arrives, neurotransmitter is released, neurotransmitter binds to receptor

Question 17

Which of the following would most likely increase the speed of action potential conduction along an axon?

Accepted Answer

Increasing the degree of myelination

Question 18

Which of the following is a function of microglial cells in the CNS?

Accepted Answer

Acting as phagocytes to remove debris and pathogens

Question 19

Which of the following best describes the relationship between a neurotransmitter and its receptor?

Accepted Answer

A neurotransmitter binds specifically to its receptor, which determines the postsynaptic response.

Introduction to the Nervous System and Nervous Tissue: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards