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problem set 7 - Kristina Madore December 3 2007 Problem...

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Kristina Madore December 3, 2007 Problem Set #7 1. A. If you hold your breath for a long time, the CO 2 concentration in your lungs and blood will rise. B. Your blood’s pH will also rise because of the increase in the release of bicarbonate ions and hydrogen ions from carbonic acid in the blood stream. C. This increase in the blood’s pH will send the signal to inhale. D. By rapidly exhaling, the swimmers are lowering their Co 2 and pH levels in their bodies. E. This could prolong the amount of time they spend swimming underwater because if their blood pH is lower and if the concentration of CO 2 in their lungs is lower, the body will send less signals to inhale. Thus, they will not have to come up for air as much. 2. A. Norepinephrine is being blocked from regulating the SA Node. This would affect the heart rate because Norepinephrine allows the cardiac cells to generate action potentials. If this is being blocked, only the Ach neurotransmitters will be left to reduce the number of action potentials as regulation. Ach causes the heart beat to slow, and without Norepinephrine to keep the balance
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