Question 1

Which of the following best describes the main function of the Peripheral Nervous System (PNS)?

Accepted Answer

Transmits sensory input and motor output between the CNS and the rest of the body.

Question 2

A patient is unable to feel pain in their left arm after a heart attack. This is an example of which phenomenon?

Accepted Answer

Referred pain

Question 3

Which type of sensory receptor is responsible for detecting changes in temperature?

Accepted Answer

Thermoreceptors

Question 4

What is the correct sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

AP arrives at axon terminal → Calcium enters terminal → Acetylcholine released → ACh binds to muscle fiber → Muscle fiber depolarizes and contracts

Question 5

Which neurotransmitter is released at the neuromuscular junction to trigger skeletal muscle contraction?

Accepted Answer

Acetylcholine (ACh)

Question 6

A toxin blocks acetylcholine receptors at the neuromuscular junction. What is the most likely effect?

Accepted Answer

Muscle paralysis

Question 7

Which of the following best explains the concept of lateral inhibition in sensory perception?

Accepted Answer

It inhibits neighboring neurons to sharpen the contrast of a stimulus.

Question 8

Which equation best represents the relationship between stimulus strength and action potential frequency in sensory neurons?

Accepted Answer

$$f = k 	imes S$$

Question 9

A patient with myasthenia gravis experiences muscle weakness and fatigue. What is the underlying cause?

Accepted Answer

Autoimmune destruction of acetylcholine receptors

Question 10

Which of the following is TRUE regarding the regeneration of nerve fibers in the peripheral nervous system (PNS)?

Accepted Answer

Schwann cells align to form a regeneration tube, guiding axon regrowth.

Question 11

Which sensory receptor type is responsible for detecting stretch in muscles and tendons, informing the brain about body position and movement?

Accepted Answer

Proprioceptors

Question 12

Which of the following is a key difference between phasic and tonic receptors?

Accepted Answer

Phasic receptors adapt rapidly to stimuli, signaling changes in intensity; tonic receptors provide continuous information about stimulus presence.

Question 13

Which of the following steps is NOT part of the basic reflex arc?

Accepted Answer

Oligodendrocyte releases neurotransmitter

Question 14

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

Accepted Answer

Muscle paralysis due to inability to contract skeletal muscles

Question 15

Which of the following best describes the role of Schwann cells in peripheral nerve regeneration?

Accepted Answer

They clear debris and form a regeneration tube to guide axon regrowth.

Question 16

Which of the following is an example of an intrinsic reflex?

Accepted Answer

Withdrawal of hand from a hot surface

Question 17

Which neurotransmitters are primarily involved in pain perception and nociception?

Accepted Answer

Substance P, glutamate, and endorphins

Question 18

Which of the following statements about receptive fields is correct?

Accepted Answer

Smaller receptive fields allow for greater sensory discrimination.

Question 19

Which division of the nervous system is responsible for regulating involuntary functions such as heart rate and digestion?

Accepted Answer

Autonomic division

Question 20

Which of the following best explains why nerve regeneration is limited in the central nervous system (CNS) compared to the peripheral nervous system (PNS)?

Accepted Answer

The CNS environment contains growth-inhibiting proteins from oligodendrocytes.

Peripheral Nervous System (PNS): Structure, Function, and Sensory Processing

Study Guide - Practice Questions

Study Guide - Flashcards