Question 1

Which type of sensory receptor is primarily responsible for detecting changes in muscle stretch and providing information about body position in space?

Accepted Answer

Proprioceptors

Question 2

A patient presents with a loss of ability to discriminate between two closely spaced points on their skin. Which aspect of sensory perception is most likely impaired?

Accepted Answer

Spatial discrimination

Question 3

Which of the following best describes the process of adaptation in sensory receptors?

Accepted Answer

Receptor membranes become less responsive and receptor potentials decline in frequency or stop

Question 4

During a heart attack, pain is often felt in the left arm rather than the chest. This phenomenon is known as:

Accepted Answer

Referred pain

Question 5

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

Accepted Answer

Schwann cells form a regeneration tube that guides axon regrowth

Question 6

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

Accepted Answer

$f_{AP} \propto I_{stimulus}$

Question 7

A patient is unable to feel a mosquito landing on their skin. Which receptor type is most likely dysfunctional?

Accepted Answer

Hair follicle receptors

Question 8

Which of the following is a characteristic of phasic receptors?

Accepted Answer

They send signals mainly at the beginning and end of a stimulus

Question 9

Which neurotransmitters are released by fibers carrying pain impulses?

Accepted Answer

Glutamate and substance P

Question 10

A person is exposed to a temperature of 5°C. Which receptor is most likely activated?

Accepted Answer

Nociceptors

Question 11

Which of the following is NOT a function of proprioceptors?

Accepted Answer

Detecting light energy

Question 12

Which of the following best explains why CNS axons do not regenerate after injury?

Accepted Answer

Oligodendrocytes release growth-inhibiting proteins and astrocytes form scar tissue

Question 13

Which receptor type is responsible for detecting deep and continuous pressure in the dermis?

Accepted Answer

Ruffini endings

Question 14

Which of the following is a correct sequence for the three levels of neural integration in sensory systems?

Accepted Answer

Receptor level → Circuit level → Perceptual level

Question 15

A patient has a genetic mutation that lowers their pain tolerance. Which statement is most accurate?

Accepted Answer

They perceive pain at the same stimulus intensity as others but tolerate it less

Question 16

Which of the following is TRUE about simple receptors of the general senses?

Accepted Answer

They are modified dendritic endings of sensory neurons

Question 17

Which of the following is an example of a scenario involving feature abstraction in sensory perception?

Accepted Answer

Distinguishing between rough and smooth textures by touch

Question 18

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

Accepted Answer

They release growth factors and line up to form a regeneration tube

Question 19

Which receptor is most likely to be activated when you feel the vibration of your phone in your pocket?

Accepted Answer

Lamellar (Pacinian) corpuscles

Question 20

Which of the following equations best represents the threshold condition for action potential generation in a sensory neuron?

Accepted Answer

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

Peripheral Nervous System: Sensory Receptors and Neural Integration

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