Question 1

Which of the following best describes the function of proprioceptors?

Accepted Answer

They respond to stretch in skeletal muscles, tendons, joints, ligaments, and connective tissue coverings, informing the brain of one’s movements.

Question 2

A patient presents with loss of fine touch and vibration sensation in the extremities. Which ascending sensory pathway is most likely affected?

Accepted Answer

Dorsal column–medial lemniscal pathway

Question 3

Which equation best represents the relationship between membrane potential change and ion movement during depolarization at the neuromuscular junction?

Accepted Answer

$$\Delta V = g_{Na^+} (E_{Na^+} - V_{m})$$

Question 4

Which sensory receptor is most likely to be activated when a person feels a gentle breeze on their skin?

Accepted Answer

Hair follicle receptor

Question 5

During the cross bridge cycle in skeletal muscle contraction, what is the immediate consequence of ATP binding to the myosin head?

Accepted Answer

The myosin head detaches from actin.

Question 6

Which of the following is TRUE regarding the stretch reflex?

Accepted Answer

It causes contraction of the stretched muscle and inhibition of its antagonist.

Question 7

A patient exhibits Babinski’s sign during a plantar reflex test. What does this indicate?

Accepted Answer

Damage to motor cortex or corticospinal tracts

Question 8

Which of the following best describes the function of the tendon organ?

Accepted Answer

It detects muscle tension and initiates relaxation.

Question 9

Which pathway is responsible for transmitting pain and temperature sensations to the somatosensory cortex?

Accepted Answer

Spinothalamic pathway

Question 10

Which of the following is a characteristic of the direct (pyramidal) motor pathway?

Accepted Answer

It regulates fast and fine (skilled) movements.

Question 11

Which of the following is NOT a function of the autonomic division of the sensorimotor system?

Accepted Answer

Control of skeletal muscle contraction

Question 12

Which of the following best describes the role of gamma (γ) efferent fibers in muscle spindles?

Accepted Answer

They help maintain spindle sensitivity by contracting the end regions of intrafusal fibers.

Question 13

Which of the following equations best represents the force generated during muscle contraction according to the sliding filament theory?

Accepted Answer

$$F = n \cdot f_{CB}$$, where $$n is $$the number of cross bridges and $$f_{CB} is $$the force per cross bridge.

Question 14

Which of the following is TRUE about the crossed-extensor reflex?

Accepted Answer

It consists of ipsilateral withdrawal and contralateral extension to maintain balance.

Question 15

Which of the following is a rapidly adapting mechanoreceptor found in the dermal papillae of hairless skin?

Accepted Answer

Tactile (Meissner’s) corpuscle

Question 16

Which of the following best describes the function of the spinocerebellar pathway?

Accepted Answer

It transmits muscle and tendon stretch information to the cerebellum for coordination.

Question 17

Which of the following is a characteristic of somatic spinal reflexes?

Accepted Answer

They occur without direct involvement of higher brain centers.

Question 18

Which of the following is TRUE regarding superficial reflexes?

Accepted Answer

They are elicited by gentle cutaneous stimulation and signal problems in upper motor pathways or cord-level reflex arcs.

Question 19

Which of the following best describes the role of acetylcholine (ACh) at the neuromuscular junction?

Accepted Answer

ACh binds to receptors on the sarcolemma, causing depolarization and triggering muscle contraction.

Sensorimotor System: Sensory Receptors, Pathways, and Reflexes

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