Question 1

Which of the following best describes the difference between afferent and efferent nerve fibers in the nervous system?

Accepted Answer

Afferent fibers carry sensory information toward the central nervous system, while efferent fibers carry motor commands away from it.

Question 2

A patient is experiencing muscle weakness due to a problem with the transmission of signals at the neuromuscular junction. Which neurotransmitter is most likely involved?

Accepted Answer

Acetylcholine

Question 3

Which equation correctly represents the Nernst equation for calculating the equilibrium potential ($$E_{ion}) of an $$ion across a membrane?

Accepted Answer

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

Question 4

During an action potential, which event is primarily responsible for the rapid depolarization phase?

Accepted Answer

Opening of voltage-gated sodium channels

Question 5

A neuron receives both excitatory and inhibitory inputs. If the sum of these inputs brings the membrane potential to threshold, what will occur?

Accepted Answer

An action potential will be generated.

Question 6

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

Accepted Answer

Myelination enables saltatory conduction, allowing action potentials to jump between nodes of Ranvier.

Question 7

Which neurotransmitter is released at the synapse between preganglionic and postganglionic neurons in both the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

Acetylcholine

Question 8

A patient is given a drug that blocks muscarinic acetylcholine receptors. Which physiological effect would most likely be observed?

Accepted Answer

Increased heart rate due to enhanced sympathetic activity

Question 9

Which of the following statements about the sympathetic and parasympathetic nervous systems is correct?

Accepted Answer

The sympathetic system generally prepares the body for 'fight or flight' responses, while the parasympathetic system promotes 'rest and digest' activities.

Question 10

Which of the following best describes the role of voltage-gated potassium channels during an action potential?

Accepted Answer

They open during repolarization to allow potassium ions to exit the cell, restoring the membrane potential.

Question 11

A patient presents with symptoms of excessive sweating, rapid heart rate, and dilated pupils. Which division of the autonomic nervous system is most likely overactive?

Accepted Answer

Sympathetic nervous system

Question 12

Which of the following is a correct description of the location of nicotinic acetylcholine receptors in the autonomic nervous system?

Accepted Answer

On the cell bodies of postganglionic neurons in autonomic ganglia

Question 13

Which of the following best explains the concept of spatial summation in neuronal signaling?

Accepted Answer

Simultaneous stimulation of a neuron by multiple presynaptic inputs at different locations

Question 14

Which equation represents the Goldman-Hodgkin-Katz equation for membrane potential ($$V_m) $$considering multiple ions?

Accepted Answer

$$V_m = \frac{RT}{F} \ln \left( \frac{P_{K^+}[K^+]_{outside} + P_{Na^+}[Na^+]_{outside} + P_{Cl^-}[Cl^-]_{inside}}{P_{K^+}[K^+]_{inside} + P_{Na^+}[Na^+]_{inside} + P_{Cl^-}[Cl^-]_{outside}} \right)$$

Question 15

A patient is exposed to a toxin that blocks voltage-gated sodium channels. What is the most likely effect on neuronal signaling?

Accepted Answer

Action potentials will be unable to initiate or propagate.

Question 16

Which of the following is a function of the enteric nervous system?

Accepted Answer

Control of digestive tract motility and secretion

Question 17

Which of the following best describes the effect of an inhibitory postsynaptic potential (IPSP) on a neuron?

Accepted Answer

It hyperpolarizes the membrane, making the neuron less likely to fire an action potential.

Question 18

A patient is given a drug that mimics the action of norepinephrine at adrenergic receptors. Which effect would most likely be observed?

Accepted Answer

Increased heart rate and dilation of bronchioles

Question 19

Which of the following is a correct statement about the location and function of autonomic receptors?

Accepted Answer

Adrenergic receptors are found on effector organs innervated by sympathetic postganglionic neurons and mediate 'fight or flight' responses.

Nervous System Study Guide: Structure, Function, and Physiology

Study Guide - Practice Questions

Study Guide - Flashcards