Question 1

Which of the following best describes the process by which sensory receptors convert physical stimuli into electrical signals?

Accepted Answer

Transduction, where a stimulus is converted into a change in membrane potential via opening or closing of gated channels.

Question 2

A patient is unable to distinguish between hot and cold objects. Which type of sensory receptor is most likely malfunctioning?

Accepted Answer

Thermoreceptors

Question 3

Which property of a stimulus is encoded by the frequency of action potentials generated by sensory neurons?

Accepted Answer

Intensity

Question 4

In the context of sensory physiology, what is a receptive field?

Accepted Answer

The specific area where a sensory neuron can be activated by a stimulus.

Question 5

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

Accepted Answer

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

Question 6

Which of the following is TRUE regarding the coding of stimulus modality in the nervous system?

Accepted Answer

Modality is determined by the type of sensory receptor activated and the location of the pathway termination in the brain.

Question 7

A person hears a sound first in their left ear and then in their right ear. What mechanism does the brain use to localize the source of the sound?

Accepted Answer

By comparing the timing of when the sound reaches each auditory cortex.

Question 8

Which of the following best explains why action potential amplitude cannot be used to determine stimulus intensity?

Accepted Answer

Action potentials are all-or-none events with constant amplitude.

Question 9

Which branch of the autonomic nervous system is primarily responsible for 'rest-and-digest' activities?

Accepted Answer

Parasympathetic

Question 10

Which anatomical feature distinguishes sympathetic from parasympathetic autonomic pathways?

Accepted Answer

Sympathetic pathways have short preganglionic and long postganglionic neurons; parasympathetic pathways have long preganglionic and short postganglionic neurons.

Question 11

A drug blocks the function of adrenergic receptors. Which branch of the autonomic nervous system will be most affected?

Accepted Answer

Sympathetic

Question 12

Which neurotransmitter is released by preganglionic neurons in both sympathetic and parasympathetic pathways?

Accepted Answer

Acetylcholine

Question 13

Which cranial nerve carries approximately 75% of all parasympathetic fibers?

Accepted Answer

Vagus nerve (cranial nerve X)

Question 14

Which of the following best describes antagonistic control in the autonomic nervous system?

Accepted Answer

Sympathetic and parasympathetic branches exert opposite effects on the same organ.

Question 15

A patient has damage to the thalamus. Which sensory function is most likely to be impaired?

Accepted Answer

Integration and relay of sensory information to the cerebral cortex.

Question 16

Which equation best represents the threshold condition for action potential generation in a sensory neuron?

Accepted Answer

$$V_{m} \geq V_{threshold}$$

Question 17

Which of the following is a function of autonomic ganglia in the autonomic nervous system?

Accepted Answer

They act as mini-integrating centers for autonomic reflexes.

Question 18

A person is exposed to a constant stimulus, but after a while, they no longer perceive it. Which property of sensory receptors explains this phenomenon?

Accepted Answer

Adaptation

Question 19

Which of the following best describes population coding in sensory physiology?

Accepted Answer

The number of sensory receptors activated increases with stimulus intensity.

Question 20

Which of the following is NOT a somatic sense?

Accepted Answer

Vision

Sensory Physiology and the Autonomic Nervous System

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