Anatomy & Physiology of Muscle Spindles

The video tutorial explains the roles of muscle spindles and Golgi tendon organs in muscle function and exercise. It covers the location and function of these sensory receptors, highlighting how Golgi tendon organs sense muscle force to prevent injury, while muscle spindles detect muscle stretch to maintain proprioception and prevent overstretching. The tutorial also details the reflex arcs involving these receptors, such as the patellar knee jerk reflex, and discusses how voluntary control can override these reflexes during exercise, potentially leading to muscle tears.

What is the primary function of Golgi tendon organs?

• To detect muscle force

• To sense muscle fatigue

• To measure muscle stretch

• To monitor joint angles

How do Golgi tendon organs help prevent tendon injuries during exercise?

• By increasing muscle contraction

• By inhibiting muscle contraction

• By stretching the muscle

• By relaxing the antagonist muscle

Where are muscle spindles located?

• In the skin

• In the joints

• In the muscle belly

• In the tendons

What do muscle spindles primarily measure?

• Muscle force

• Muscle stretch

• Muscle fatigue

• Joint angles

What is the role of intrafusal muscle fibers?

• To relax the muscle

• To contract the muscle

• To sense muscle stretch

• To generate muscle force

In the muscle spindle reflex arc, what happens to the agonist muscle?

• It relaxes

• It stretches further

• It remains unchanged

• It contracts

What is the role of the interneuron in the muscle spindle reflex arc?

• To measure muscle force

• To stretch the muscle

• To inhibit the antagonist muscle

• To excite the agonist muscle

What reflex is demonstrated when a physician taps the patellar ligament?

• Achilles reflex

• Bicep reflex

• Tricep reflex

• Patellar knee jerk reflex

How can voluntary control affect the muscle spindle reflex during exercise?

• It can override the reflex

• It can enhance the reflex

• It can delay the reflex

• It can eliminate the reflex

What can happen if the muscle spindle reflex is overridden during a deadlift?

• The muscle stretches less

• The muscle contracts more

• The muscle relaxes

• The muscle tears