Question 1

Which division of the nervous system is primarily responsible for the 'rest and digest' response, and what neurotransmitter is most commonly associated with this division?

Accepted Answer

Parasympathetic division; acetylcholine

Question 2

During an action potential, which ion channels open first, and what is the resulting effect on the membrane potential?

Accepted Answer

Sodium channels; membrane depolarizes

Question 3

A patient is exposed to curare, which blocks acetylcholine receptors at the neuromuscular junction. What clinical effect would you expect?

Accepted Answer

Paralysis due to inability to contract muscles

Question 4

Which of the following best describes the role of calcium ions ($$Ca^{2+}) in $$the presynaptic terminal of a neuron?

Accepted Answer

They trigger the release of neurotransmitters into the synaptic cleft.

Question 5

Which of the following is a function of inhibitory interneurons in sensory physiology?

Accepted Answer

They prevent overstimulation by limiting the response.

Question 6

If a neuron is exposed to a drug that blocks voltage-gated potassium channels, what would be the most likely effect on the action potential?

Accepted Answer

The neuron would repolarize more slowly.

Question 7

Which of the following best explains lateral inhibition in sensory pathways?

Accepted Answer

It sharpens sensory perception by inhibiting neighboring neurons.

Question 8

Which neurotransmitter is primarily released by postganglionic sympathetic neurons?

Accepted Answer

Norepinephrine

Question 9

A patient presents with muscle weakness. Laboratory tests reveal a defect in the acetylcholine receptor at the neuromuscular junction. Which process is most directly impaired?

Accepted Answer

Depolarization of the muscle cell membrane

Question 10

Which of the following best describes the function of rods in the human eye?

Accepted Answer

They are responsible for vision in low-light conditions.

Question 11

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

Accepted Answer

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

Question 12

Which of the following best describes the effect of opening ligand-gated sodium channels on a postsynaptic neuron?

Accepted Answer

It causes depolarization, increasing the likelihood of an action potential.

Question 13

Which sensory receptor type is most likely to respond to changes in temperature?

Accepted Answer

Thermoreceptors

Question 14

Which of the following statements about the autonomic nervous system is correct?

Accepted Answer

The parasympathetic division slows the heart rate.

Question 15

A patient has a mutation that prevents the closure of voltage-gated sodium channels. What is the most likely effect on neuronal signaling?

Accepted Answer

The neuron will remain depolarized, impairing repolarization.

Question 16

Which of the following best describes the function of the axon hillock in a neuron?

Accepted Answer

It integrates incoming signals and initiates action potentials.

Question 17

Which of the following is a real-world example of a reflex arc involving the somatic nervous system?

Accepted Answer

Withdrawal of a hand from a hot surface

Question 18

Which of the following best explains the difference between muscarinic and adrenergic receptors?

Accepted Answer

Muscarinic receptors bind acetylcholine; adrenergic receptors bind norepinephrine and epinephrine.

Question 19

Which of the following best describes the process of synaptic summation?

Accepted Answer

The combined effect of multiple synaptic inputs on a postsynaptic neuron.

Study Guide: Nervous System, Sensory Physiology, and Muscle Physiology

Study Guide - Practice Questions

Study Guide - Flashcards