Question 1

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

Accepted Answer

The conversion of a stimulus into a graded or action potential in a receptor cell.

Question 2

A patient is unable to localize a painful stimulus on their skin. Which property of sensory receptors is most likely impaired?

Accepted Answer

Receptive field size

Question 3

Which type of receptor is responsible for detecting changes in blood pressure within arteries?

Accepted Answer

Baroreceptors

Question 4

A person quickly adapts to the feeling of their clothes but continues to feel pain from a paper cut. Which receptor properties explain this difference?

Accepted Answer

Tactile receptors are phasic and adapt quickly; nociceptors are tonic and do not adapt.

Question 5

Which of the following best describes the function of muscle spindles in the stretch reflex?

Accepted Answer

They detect changes in muscle length and initiate a reflex contraction.

Question 6

A patient steps on a sharp object with their right foot and immediately withdraws it while their left leg straightens to support their weight. Which reflexes are involved?

Accepted Answer

Flexor (withdrawal) reflex and crossed extensor reflex

Question 7

Which of the following equations best represents the relationship between stimulus intensity and action potential frequency in sensory coding?

Accepted Answer

$$f = k \cdot I$$

Question 8

Which neural circuit pattern allows a single sensory neuron to stimulate multiple regions of the CNS simultaneously?

Accepted Answer

Divergence

Question 9

Which of the following is TRUE regarding the tendon reflex?

Accepted Answer

It prevents excessive tension in tendons by inhibiting motor neuron activity.

Question 10

A patient exhibits a positive Babinski sign. What does this indicate about their nervous system?

Accepted Answer

There is a loss of descending inhibition from higher CNS centers.

Question 11

Which of the following best describes the difference between monosynaptic and polysynaptic reflexes?

Accepted Answer

Monosynaptic reflexes involve a direct connection between sensory and motor neurons; polysynaptic reflexes involve interneurons.

Question 12

Which receptor type is responsible for detecting the position and movement of joints and muscles?

Accepted Answer

Proprioceptors

Question 13

Which of the following best explains why you quickly stop noticing the feeling of sunglasses on your head?

Accepted Answer

Root hair plexuses are phasic receptors that adapt quickly to constant stimuli.

Question 14

Which of the following is a function of central adaptation in sensory processing?

Accepted Answer

It reduces the conscious awareness of a constant stimulus by filtering sensory input in the CNS.

Question 15

Which of the following best describes the role of gamma motor neurons in muscle spindles?

Accepted Answer

They adjust the sensitivity of intrafusal fibers to maintain muscle tone.

Question 16

Which of the following is an example of a visceral (autonomic) reflex?

Accepted Answer

Regulation of heart rate in response to blood pressure changes

Question 17

Which of the following best describes the effect of facilitation from higher CNS centers on spinal reflexes?

Accepted Answer

It enhances the response of spinal reflexes, making them more pronounced.

Question 18

Which of the following is TRUE regarding the labeled line principle in sensory pathways?

Accepted Answer

Each labeled line carries information about a specific type of stimulus to a specific region of the cortex.

Question 19

Which of the following best explains why the flexor reflex is often accompanied by the crossed extensor reflex?

Accepted Answer

To maintain balance by extending the opposite limb when one limb is withdrawn from a painful stimulus.

Question 20

Which of the following is a characteristic of phasic receptors?

Accepted Answer

They adapt quickly to constant stimuli and are inactive unless a new stimulus arrives.

Sensory Receptors and Spinal Reflexes: Study Guide

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