Question 1

Which structure is responsible for detecting changes in muscle length and mediating the stretch reflex?

Accepted Answer

Muscle spindle

Question 2

During the knee-jerk reflex, which type of neural pathway is primarily involved?

Accepted Answer

Monosynaptic reflex

Question 3

What is the main function of the Golgi tendon organ in skeletal muscle?

Accepted Answer

Preventing excessive tension by inhibiting muscle contraction

Question 4

Which of the following best describes the role of gamma motor neurons?

Accepted Answer

They adjust the sensitivity of muscle spindles by stimulating intrafusal fibers.

Question 5

A patient presents with exaggerated muscle tone and hyperactive stretch reflexes. Which neural component is most likely malfunctioning?

Accepted Answer

Alpha motor neurons are overactive.

Question 6

Which of the following is TRUE regarding the structure of muscle spindles?

Accepted Answer

They are encapsulated and contain both nuclear bag and nuclear chain fibers.

Question 7

Which equation best represents the relationship between force ($$F) $$generated by a muscle and the number of active motor units ($$n) $$and average force per unit ($$f$$)?

Accepted Answer

$$F = n 	imes f$$

Question 8

During a withdrawal reflex, what occurs in the contralateral limb?

Accepted Answer

Extensor muscles contract and flexor muscles relax.

Question 9

Which type of sensory ending is primarily responsible for detecting the rate of change in muscle length?

Accepted Answer

Primary or annulospiral endings

Question 10

If the muscle spindle is damaged, which reflex would be most affected?

Accepted Answer

Stretch (myotatic) reflex

Question 11

Which of the following best describes reciprocal innervation during a stretch reflex?

Accepted Answer

Agonist muscle contracts while antagonist muscle relaxes.

Question 12

A sudden increase in muscle tension activates which receptor, leading to inhibition of the contracting muscle?

Accepted Answer

Golgi tendon organ

Question 13

Which of the following is a correct sequence for the monosynaptic stretch reflex arc?

Accepted Answer

Sensory neuron → motor neuron → muscle

Question 14

Which of the following statements about intrafusal fibers is correct?

Accepted Answer

They are found within the muscle spindle and are sensitive to stretch.

Question 15

Which of the following best explains the function of nuclear bag fibers in muscle spindles?

Accepted Answer

They detect dynamic changes in muscle length.

Question 16

A patient with damage to the gamma motor neurons would most likely experience which of the following?

Accepted Answer

Decreased sensitivity of muscle spindles to stretch

Question 17

Which of the following equations correctly represents the relationship between muscle tone ($$T$$), spindle sensitivity ($$S$$), and gamma motor neuron activity ($$G$$)?

Accepted Answer

$$T = S 	imes G$$

Question 18

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

Accepted Answer

It causes contraction of extensor muscles in the opposite limb.

Question 19

Which of the following best describes the role of alpha motor neurons?

Accepted Answer

They innervate extrafusal fibers to produce muscle contraction.

Question 20

Which of the following is a real-life example of a disynaptic reflex?

Accepted Answer

Golgi tendon reflex

Physio: Muscle III

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