Forty-eight-year old Marcy rides her bicycle through the park with her husband. While approaching a pot hole, she does not turn in time to miss it. She remarks to her husband, "I just don't seem to react as quickly as I used to." Why have Marcy's reaction times slowed over the years?
A. loss of neurons
B. loss of muscle tone
C. loss of myelination
D. loss of bone density
Answer: A
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