Question

Case study 22.1 (p.511) Which statement is true, given the circumstance in which Tim found himself? The racing heart resulted from a day of intense exercise, including climbing the bluff Increased heart rate is abnormal, given that Tim was well rested. Tim experienced a normal reaction to a threat Tim is hallucinating because there are no mountain lions in the Ozarks. Tim experienced the rest-and-repair response. Case study 22 scenario (p.511) hiking in the Ozark Mountains when he decided to take some time to rest at the top of a bluff with a beautiful view of the river below. Soon he was dozing. After waking from a restful nap, he saw a mountain lion less than a hundred feet from him! The lion was not looking in his direction. In fact, it took no interest in Tim and simply walked away into the thick forest atop the bluff. Despite this restful nap, Tim noticed that his heart Tim was racing! was now

Answer 1

22.1 Tim experiences a normal reaction to threat

Increased heart rate is a result of sympathetic activity and increase in the secretion of various hormones like epinephrine, norepinephrine and few other in the body. These reactions occur when we are facing a threat or sense danger. These reactions prepare our body to respond to the situation. The reaction can be either to face the danger called fight or to avoid it called as flight. The changes that occur in body are increase heart rate, increased breathing, increase blood supply to muscles, reduces digestive activity, dilation of pupils etc.

22.3 Increased rate of breathing

This is a part of fight or flight response that is occurring in the Tim’s body. Increase breathing rate help the body to receive more oxygen so that it can release more energy and react to the threatening stimulus better. The stimulus is the sight of lion in this case.

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