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Forty-Eight-Year Old Marcy Rides Her Bicycle Through the Park with Her

Question 20

Multiple Choice

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

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