Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 39.5, Problem 1TC

John comes to the emergency room with neither voluntary movement nor feeling in his legs. The ER physician pricks his leg with a pin and finds that his leg still withdraws from the pain. How can John have a normal pain-withdrawal reflex but feel no pain?

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Peyton felt strange when she awoke one morning. She could not hold a pen in her right hand when trying to write an entry in her diary, and her muscles were noticeably weaker on the right side of her body. Additionally, her husband noticed that she was slurring her speech, so he took her to the emergency room. What does the ER physician suspect has occurred? Where in the brain might the physician suspect that abnormal activity or perhaps a lesion is located, and why?
Why can polysynaptic reflexes produce more complex responses than can monosynaptic reflexes?
Why must the withdrawal reflex, but not the stretch reflex, involve a polysynaptic reflex arc?
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