Which of the following normally occurs when a doctor's reflex hammer taps a patient's patellar tendon?
A. Alpha motor neurons stimulate contraction of extrafusal fibers in extensor muscles.
B. Alpha motor neurons stimulate contraction of intrafusal fibers in extensor muscles.
C. Golgi tendon organs in the patellar tendon stimulate the contraction of extrafusal fibers of extensor muscles.
D. Alpha motor neurons that innervate ipsilateral flexor muscles are stimulated.
E. Inhibitory interneurons reduce action potential firing in alpha motor neurons to extrafusal fibers of extensor muscles.
Answer: A
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