The anatomy and physiology instructor is discussing reflex systems with the prenursing class. What system would the instructor say causes a muscle fiber contraction that relieves the stretch?
A) Arch reflex system
B) Spinal reflex system
C) Spindle gamma loop system
D) Stretch receptor system
C
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A spindle gamma loop system responds to stretch receptors or spindles on muscle fibers to cause a muscle fiber contraction that relieves the stretch. In this system, nerves from stretch receptors form a synapse with gamma nerves in the spinal cord, which send an impulse to the stretched muscle fibers to stimulate their contraction. These reflexes are responsible for maintaining muscle tone and keeping an upright position against the pull of gravity and are important in helping venous return when the contracting muscle fibers massage veins to help move the blood toward the heart. The arch reflex system and the stretch receptor system are distracters for this question. The spinal reflex system is not the reflex systems that respond to stretch receptors in the body.
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