Q: Which equation best represents the relationship between stimulus strength and action potential frequency in a sensory neuron?

$$\text{Stimulus Strength} \propto \text{Receptor Potential} \propto \text{Action Potential Frequency}$$

Question 1

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

Accepted Answer

Conversion of a stimulus into an action potential that the CNS can interpret.

Question 2

A patient is unable to distinguish between two closely spaced points on their back, but can easily do so on their fingertips. Which of the following best explains this phenomenon?

Accepted Answer

The receptive fields on the fingertips are smaller, increasing tactile acuity.

Question 3

Which type of sensory receptor is most likely to respond to a change in muscle length during stretching?

Accepted Answer

Ruffini corpuscles

Question 4

A person enters a room with a strong odor, but after a few minutes, they no longer notice the smell. Which physiological process is responsible for this?

Accepted Answer

Habituation

Question 5

Which of the following best describes the difference between tonic and phasic receptors?

Accepted Answer

Tonic receptors adapt slowly and signal the duration of a stimulus, while phasic receptors adapt rapidly and signal changes in stimulus.

Question 6

Which equation best represents the relationship between stimulus strength and action potential frequency in a sensory neuron?

Accepted Answer

$$	ext{Stimulus Strength} \propto 	ext{Receptor Potential} \propto 	ext{Action Potential Frequency}$$

Question 7

Which of the following is a function of lateral inhibition in sensory pathways?

Accepted Answer

Enhancing the contrast between the center and periphery of a stimulated region, improving localization of the stimulus.

Question 8

A patient reports a sharp, localized pain immediately after touching a hot surface, followed by a dull, aching pain. Which fibers are responsible for each sensation?

Accepted Answer

Aδ fibers for sharp pain, C fibers for dull pain

Question 9

Which of the following best explains why pain from a heart attack is often felt in the left arm?

Accepted Answer

Convergence of visceral and somatic afferent neurons onto the same second-order neuron in the spinal cord.

Question 10

Which of the following statements about population coding is correct?

Accepted Answer

It involves multiple sensory units working together to encode stimulus intensity.

Question 11

Which neurotransmitters are primarily released by nociceptors to transmit pain signals to the CNS?

Accepted Answer

Substance P and glutamate

Question 12

Which of the following best describes the Gate Control Theory of pain modulation?

Accepted Answer

Stimulation of Aβ fibers excites inhibitory interneurons, decreasing pain signal transmission.

Question 13

Which of the following is true regarding the adaptation of sensory receptors?

Accepted Answer

Phasic receptors adapt rapidly and are best for detecting changes in stimulus.

Question 14

Which of the following best explains why opioids are effective in treating chronic, pathological pain?

Accepted Answer

They decrease neurotransmitter release from primary sensory neurons and cause postsynaptic inhibition in the CNS.

Question 15

Which of the following is the correct order of neurons in the labeled line pathway for somatosensory information?

Accepted Answer

Primary afferent neuron → Second-order neuron (CNS) → Third-order neuron (thalamus to cortex)

Question 16

Which of the following best describes the effect of increasing the overlap between receptive fields?

Accepted Answer

It decreases acuity unless lateral inhibition is present.

Question 17

Which of the following is a characteristic of Aβ fibers?

Accepted Answer

Large, myelinated fibers that conduct mechanical stimuli rapidly.

Question 18

A patient with diabetic neuropathy experiences pain much greater than would be expected from the degree of tissue damage. This is an example of:

Accepted Answer

Pathological pain

Question 19

Which of the following best describes the role of endogenous opioids in pain modulation?

Accepted Answer

They inhibit neurotransmitter release from primary sensory neurons and cause postsynaptic inhibition.

Question 20

Which of the following is true regarding the transmission of dentinal and pulp pain in teeth?

Accepted Answer

Dentinal pain is primarily transmitted by Aδ fibers, while pulp pain is primarily transmitted by C fibers.

Sensory Physiology: Mechanisms and Pathways of Sensory Perception

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