Question 1

Which type of sensory receptor is primarily responsible for detecting changes in muscle length during a stretch reflex?

Accepted Answer

Muscle spindle receptors

Question 2

A patient loses the ability to sense fine touch on their fingertips but can still detect pain and temperature. Which receptor type is most likely damaged?

Accepted Answer

Merkel disc receptors

Question 3

Which of the following best describes the concept of 'punctate distribution' in sensory receptors?

Accepted Answer

Receptors are clustered in specific areas, leading to regions of high sensitivity

Question 4

If a person touches a hot stove and immediately withdraws their hand, which receptor type initiates this response?

Accepted Answer

Nociceptors

Question 5

Which of the following equations correctly represents the relationship between stimulus intensity ($$I) $$and receptor potential ($$V) in a $$sensory neuron, assuming a linear response?

Accepted Answer

$$V = kI$$

Question 6

A patient is unable to maintain balance when standing with eyes closed. Which receptor type is most likely impaired?

Accepted Answer

Equilibrioceptors in the inner ear

Question 7

Which sensory pathway involves three neurons and crosses over to the opposite side of the spinal cord at the level of the second neuron?

Accepted Answer

General sensory ascending pathway

Question 8

Which receptor adapts quickly to a constant stimulus, resulting in decreased perception over time?

Accepted Answer

Pacinian corpuscles

Question 9

A person is unable to detect changes in skin temperature. Which type of receptor is most likely malfunctioning?

Accepted Answer

Thermoreceptors

Question 10

Which of the following best explains why adaptation occurs in some sensory receptors?

Accepted Answer

Receptors decrease their response to a constant stimulus over time

Question 11

Which equation best represents the total number of action potentials ($$N) $$generated by a sensory neuron in response to a stimulus of duration $$t$$ and frequency $$f$$?

Accepted Answer

$$N = t 	imes f$$

Question 12

A person can distinguish two points on their skin as separate only if the points are a certain minimum distance apart. This phenomenon is best explained by:

Accepted Answer

Punctate distribution of sensory receptors

Question 13

Which receptor type is responsible for detecting chemical changes in the environment, such as taste and smell?

Accepted Answer

Chemoreceptors

Question 14

If the first-order sensory neuron synapses in the spinal cord, where does the second-order neuron typically cross to the opposite side?

Accepted Answer

At the level of the spinal cord

Question 15

Which of the following is NOT a characteristic of mechanoreceptors?

Accepted Answer

They detect changes in temperature

Question 16

A patient reports loss of proprioception and cannot tell the position of their limbs with eyes closed. Which receptor type is most likely affected?

Accepted Answer

Proprioceptors

Question 17

Which of the following best describes the function of the third-order neuron in a sensory pathway?

Accepted Answer

It transmits sensory information from the thalamus to the cerebral cortex

Question 18

Which equation represents the threshold stimulus ($$S_{th}) $$required to generate an action potential in a sensory neuron, given the resting membrane potential ($$V_{rest}) $$and the threshold potential ($$V_{th}$$)?

Accepted Answer

$$S_{th} = V_{th} - V_{rest}$$

Question 19

Which receptor type is most likely to be activated when you change the position of your arm without visual input?

Accepted Answer

Proprioceptors

Question 20

Which of the following is a correct sequence for the three-neuron sensory pathway from the skin to the cerebral cortex?

Accepted Answer

First-order neuron → spinal cord → second-order neuron → thalamus → third-order neuron → cerebral cortex

Sensory Receptors and Sensory Pathways in the Nervous System

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