Question 1

Which area of the cerebral cortex is primarily responsible for controlling voluntary skeletal muscle movement on the opposite side of the body?

Accepted Answer

Motor areas in the frontal lobe

Question 2

A patient presents with loss of sensation in their fingertips but retains sensation in their forearm. Which concept best explains this difference in sensitivity?

Accepted Answer

Smaller receptive fields in the fingertips

Question 3

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

Accepted Answer

Conversion of stimulus energy into a change in membrane potential

Question 4

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

Accepted Answer

Referred pain

Question 5

Which type of receptor is responsible for detecting changes in temperature?

Accepted Answer

Thermoreceptors

Question 6

The intensity of a sensory stimulus is primarily coded by:

Accepted Answer

The number of receptors activated and frequency coding

Question 7

Which of the following is TRUE regarding the function of the amygdala in the central nervous system?

Accepted Answer

It is involved in emotional processing and links to memory

Question 8

Which of the following best describes the role of the association areas of the cerebral cortex?

Accepted Answer

Integrate information from sensory and motor areas and direct voluntary behaviors

Question 9

A drug blocks calcium channels on nociceptive neurons. What is the most likely effect?

Accepted Answer

It is used to treat severe and chronic pain as an analgesic.

Question 10

Which of the following is a correct sequence for the transmission of sensory information from the skin to the brain?

Accepted Answer

Primary sensory neuron → secondary sensory neuron → tertiary sensory neuron → thalamus → somatosensory cortex

Question 11

Which sensory area of the cerebral cortex is located within the insula and is responsible for processing taste information?

Accepted Answer

Primary gustatory cortex

Question 12

Which of the following statements about photoreceptors is TRUE?

Accepted Answer

Rods function well in low light and are used in night vision.

Question 13

Which of the following is NOT a basic taste sensation?

Accepted Answer

Spicy

Question 14

Which process allows the CNS to decrease perception of a constant stimulus over time?

Accepted Answer

Habituation

Question 15

Which of the following best explains why the brain cannot distinguish between stimuli arising from visceral versus somatic receptors in referred pain?

Accepted Answer

Visceral and somatic sensory pain inputs converge on a single ascending tract

Question 16

Which of the following is the correct formula for calculating the threshold stimulus required to generate an action potential?

Accepted Answer

$I_{threshold} = \frac{V_{threshold}}{R}$

Question 17

Which of the following is TRUE about the two-point discrimination test?

Accepted Answer

It shows that smaller receptive fields allow for greater sensitivity and discrimination.

Question 18

Which neurotransmitters and chemicals are involved in mediating the inflammatory response at the site of injury?

Accepted Answer

Potassium ions ($K^+$), histamine, prostaglandins, serotonin, substance P

Question 19

Which of the following is a function of the primary somatosensory cortex?

Accepted Answer

Receives somatic sensory information from proprioceptors, touch, pressure, pain, and temperature receptors

Question 20

Which of the following best describes the difference between fast pain and slow pain?

Accepted Answer

Fast pain is sharp and localized, transmitted by Aδ fibers; slow pain is dull and diffuse, transmitted by C fibers.

Central Nervous System: Structure and Functional Areas of the Brain

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