MUSCLE PHYSIOLOGY

PHYSIOLOGY

MUSCLE RECEPTORS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The muscle spindle responds to tension with muscle relaxation
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -The ends of the intrafusal fibers are contractile, but the central portion is noncontractile and innervated by special neurons named gamma motor neurons. Muscle spindles are sensitive to both the phasic stretch (the rate at which a muscle stretches) and the tonic stretch (the extent to which the muscle is stretched).

Detailed explanation-2: -Because of the speed of stretch the spindles fire rapid impulses to the nervous system causing a rapid contraction in the stretched muscles. This response protects you from a completely torn muscle or broken ankle, and usually results in nothing worse than a minor sprain.

Detailed explanation-3: -The relaxation of the antagonist that occurs simultaneously when a muscle spindle’s contraction of its associated muscle occurs is called reciprocal inhibition. Ultimately, the muscle spindle functions to alert the brain that nearby joints and soft tissues are in danger of being stretched too far.

Detailed explanation-4: -Which is TRUE about muscle spindles? They send information about muscle stretch to the CNS.

There is 1 question to complete.