The primary sensory ending of a muscle spindle is stimulated by A. Sh

1.	The primary sensory ending of a muscle spindle is stimulated by A. Shortening of an antagonist muscle. B. Relaxation of the muscle concerned when under load. C. Shortening of the extrafusal fibres. D. Stimulation of the gamma efferent fibres. E. Striking the appropriate tendon with a tendon hammer.
Answer» A. True This stretches the agonist and its spindles. B. True This also stretches the spindles. C. False This reduces the stretch of the spindle. D. True Muscle contraction at each end of the spindle stretches the nuclear bag. E. True The knee jerk is initiated by striking the patellar tendon which stretches spindles in the quadriceps muscle.

The primary sensory ending of a muscle spindle is stimulated by A. Shortening of an antagonist muscle. B. Relaxation of the muscle concerned when under load. C. Shortening of the extrafusal fibres. D. Stimulation of the gamma efferent fibres. E. Striking the appropriate tendon with a tendon hammer.

Answer»

A. True This stretches the agonist and its spindles.

B. True This also stretches the spindles.

C. False This reduces the stretch of the spindle.

D. True Muscle contraction at each end of the spindle stretches the nuclear bag.

E. True The knee jerk is initiated by striking the patellar tendon which stretches spindles in the quadriceps muscle.

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The primary sensory ending of a muscle spindle is stimulated by A. Shortening of an antagonist muscle. B. Relaxation of the muscle concerned when under load. C. Shortening of the extrafusal fibres. D. Stimulation of the gamma efferent fibres. E. Striking the appropriate tendon with a tendon hammer.

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