Question 1

Which of the following best describes the primary function of the peripheral nervous system (PNS)?

Accepted Answer

To transmit signals between the central nervous system and the rest of the body

Question 2

A patient is unable to distinguish between a light touch and a painful stimulus on their skin. Which type of sensory receptor is most likely malfunctioning?

Accepted Answer

Nociceptors

Question 3

Which of the following best differentiates phasic receptors from tonic receptors?

Accepted Answer

Phasic receptors adapt rapidly to a constant stimulus, while tonic receptors adapt slowly or not at all.

Question 4

Which equation correctly represents the relationship between stimulus intensity and action potential frequency in sensory neurons?

Accepted Answer

$$f = k \cdot I$$

Question 5

A patient experiences pain in their left arm during a heart attack. This is an example of:

Accepted Answer

Referred pain

Question 6

Which neurotransmitter is primarily released at the neuromuscular junction to stimulate muscle contraction?

Accepted Answer

Acetylcholine

Question 7

During lateral inhibition in the somatosensory system, what is the main effect on sensory perception?

Accepted Answer

It sharpens the contrast between stimulated and non-stimulated areas, improving spatial resolution.

Question 8

Which of the following best describes the process of neural integration in the central nervous system?

Accepted Answer

The summation and processing of incoming signals to produce an appropriate response

Question 9

A patient who has lost a limb continues to feel pain in the missing limb. This phenomenon is known as:

Accepted Answer

Phantom limb pain

Question 10

Which of the following steps is NOT involved in the regeneration of a peripheral nerve after injury?

Accepted Answer

Formation of a glial scar by astrocytes

Question 11

Which of the following best describes the pathway of a simple reflex arc?

Accepted Answer

Receptor → Sensory neuron → Interneuron → Motor neuron → Effector

Question 12

Which of the following is a characteristic of sensory perception?

Accepted Answer

It involves interpretation of sensory input by the cerebral cortex.

Question 13

A patient with multiple sclerosis has demyelination at the neuromuscular junction. Which of the following is most likely to occur?

Accepted Answer

Decreased efficiency of signal transmission to the muscle

Question 14

Which of the following best explains how smooth muscle contraction is regulated?

Accepted Answer

By autonomic nervous system input and local chemical signals

Question 15

If a disease state blocks acetylcholine receptors at the neuromuscular junction, what is the most likely effect?

Accepted Answer

Muscle paralysis or weakness

Question 16

Which of the following is true regarding receptive fields in sensory perception?

Accepted Answer

Smaller receptive fields allow for greater spatial resolution.

Question 17

Which neurotransmitter is most commonly associated with the transmission of pain signals in the central nervous system?

Accepted Answer

Substance P

Question 18

A patient presents with a loss of pain and temperature sensation but retains touch and pressure sensation. Which type of sensory receptor is most likely affected?

Accepted Answer

Nociceptors and thermoreceptors

Question 19

Which of the following best describes the process by which an action potential is transmitted from a nerve to a muscle at the neuromuscular junction?

Accepted Answer

Release of acetylcholine, binding to receptors, depolarization of muscle membrane

Question 20

Which of the following is a key difference between somatic and autonomic reflexes?

Accepted Answer

Somatic reflexes involve skeletal muscles, while autonomic reflexes involve smooth or cardiac muscle and glands.

Peripheral Nervous System: Sensory Function, Integration, and Reflexes

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