Question 1

Which type of sensory receptor is primarily responsible for detecting changes in blood chemistry, such as oxygen or glucose levels?

Accepted Answer

Chemoreceptors

Question 2

A patient presents with a loss of proprioception, resulting in poor coordination and balance. Which type of receptor is most likely impaired?

Accepted Answer

Proprioceptors

Question 3

Which of the following best describes the function of encapsulated dendritic endings such as Meissner's (tactile) corpuscles?

Accepted Answer

Detecting light touch and discriminative touch

Question 4

A person touches a hot stove and immediately withdraws their hand. Which receptor type is primarily responsible for detecting the extreme heat?

Accepted Answer

Nociceptors

Question 5

Which of the following equations correctly represents the threshold for action potential generation in sensory neurons?

Accepted Answer

$$V_{graded} \geq V_{threshold}$$

Question 6

Which statement best explains the difference between sensation and perception?

Accepted Answer

Sensation is the awareness of stimuli, while perception is the conscious interpretation of those stimuli.

Question 7

Which of the following is NOT a function of the somatosensory system?

Accepted Answer

Processing visual information

Question 8

A patient experiences referred pain in their left arm during a heart attack. What is the physiological basis for this phenomenon?

Accepted Answer

Pain fibers from the heart and arm converge on the same spinal neurons

Question 9

Which connective tissue covering surrounds individual axons and their myelin sheaths within a nerve?

Accepted Answer

Endoneurium

Question 10

Which of the following best describes the adaptation property of phasic receptors?

Accepted Answer

They respond rapidly and signal at the beginning or end of a stimulus.

Question 11

Which equation best represents the relationship between magnitude estimation and frequency of nerve impulses?

Accepted Answer

$$I_{magnitude} \propto f_{impulses}$$

Question 12

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

Accepted Answer

PNS axons can regenerate if the soma is intact and damage is not severe.

Question 13

Which type of ganglia contains cell bodies of sensory neurons associated with afferent nerve fibers?

Accepted Answer

Dorsal root ganglia

Question 14

Which of the following is a feature of nonencapsulated (free) nerve endings?

Accepted Answer

They respond mostly to temperature, pain, or light touch.

Question 15

A patient is unable to distinguish between sweet and sour tastes. Which aspect of sensory perception is most likely impaired?

Accepted Answer

Quality discrimination

Question 16

Which of the following best describes the role of NMDA receptors in chronic pain?

Accepted Answer

They strengthen neural connections during long-lasting or intense pain, leading to hyperalgesia.

Question 17

Which of the following is NOT a characteristic of tonic receptors?

Accepted Answer

They respond rapidly and signal only at the beginning or end of a stimulus.

Question 18

Which of the following best explains why a person with a severed limb may still feel pain in the missing limb (phantom limb pain)?

Accepted Answer

Pain signals are generated by remaining nerves in the stump and interpreted by the brain as coming from the missing limb.

Question 19

Which of the following best describes the function of muscle spindles?

Accepted Answer

Monitoring muscle stretch and length

Question 20

Which of the following is the correct order of neural integration levels in the somatosensory system?

Accepted Answer

Receptor level → Circuit level → Perceptual level

Sensory Receptors, Somatosensory System, and Nerve Structure

Study Guide - Practice Questions