You are carrying a box when your friend suddenly places another heavy box on top of it. Your muscles respond by immediately ________ because ________ sense the rapid muscle lengthening and cause a reflex response.
A. completely relaxing; Golgi tendon organs
B. relaxing; muscle spindles
C. contracting; Golgi tendon organs
D. contracting; muscle spindles
Answer: D
Anatomy & Physiology
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