$$\text{Tension} = \text{Force} / \text{Area}$$

Question 1

Which of the following best describes the function of muscle spindles in skeletal muscle?

Accepted Answer

They detect changes in muscle length and trigger muscle contraction.

Question 2

A patient presents with loss of fine touch and proprioception on the right side of the body. Which ascending sensory pathway is most likely damaged?

Accepted Answer

Dorsal column–medial lemniscal pathway

Question 3

Which of the following is TRUE regarding the direct (pyramidal) motor pathways?

Accepted Answer

They regulate fast and fine (skilled) movements.

Question 4

Which receptor type is most likely to be activated when you touch a hot stove and immediately withdraw your hand?

Accepted Answer

Nociceptors

Question 5

A lesion in the corticospinal tract would most likely result in which of the following clinical findings?

Accepted Answer

Loss of voluntary motor control

Question 6

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 initiating an action potential.

Question 7

Which of the following equations correctly represents the relationship between force, muscle length, and tension as detected by proprioceptors?

Accepted Answer

$$	ext{Tension} = 	ext{Force} / 	ext{Area}$$

Question 8

Which of the following is a function of the indirect (extrapyramidal) motor pathways?

Accepted Answer

Control of axial muscles for balance and posture

Question 9

A patient has an abnormal plantar reflex (Babinski’s sign) with dorsiflexion of the hallux and fanning of the toes. What does this indicate?

Accepted Answer

Damage to the motor cortex or corticospinal tract

Question 10

Which of the following best describes the sequence of events in the cross-bridge cycle during muscle contraction?

Accepted Answer

Myosin head attaches to actin, power stroke occurs, ATP binds to myosin, myosin detaches from actin.

Question 11

Which of the following is NOT a characteristic of a polysynaptic reflex?

Accepted Answer

Always involves only one sensory and one motor neuron

Question 12

Which type of sensory receptor is most densely located in the fingertips and is responsible for discriminative touch?

Accepted Answer

Tactile (Meissner’s) corpuscles

Question 13

Which of the following best explains why the brain can override a spinal reflex, such as not withdrawing your arm during a blood test?

Accepted Answer

Descending pathways from the brain can modulate or inhibit reflex activity at the spinal cord level.

Question 14

Which of the following is the correct order of neural integration in sensory systems?

Accepted Answer

Receptor level → Circuit level → Perceptual level

Question 15

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

Accepted Answer

Detect muscle tension and trigger muscle relaxation

Question 16

A patient is unable to maintain balance after stepping on a sharp object, and both legs collapse. Which reflex is most likely impaired?

Accepted Answer

Crossed-extensor reflex

Question 17

Which of the following is TRUE regarding the function of gamma (γ) efferent fibers in muscle spindles?

Accepted Answer

They maintain spindle sensitivity during muscle contraction.

Question 18

Which of the following best describes the difference between sensation and perception?

Accepted Answer

Sensation is the awareness of changes in the environment, while perception is the conscious interpretation of those stimuli.

Question 19

Which of the following is a real-life example of a learned (acquired) reflex?

Accepted Answer

Driving skills

Sensorimotor System: Sensory Receptors, Pathways, and Reflexes

Study Guide - Practice Questions