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The blood needs to circulate through the body. It picks up oxygen from the lungs and transports it to the cells, in turn picking up their waste CO2 and delivering it to the lungs to be exhaled. It also picks up nutrients from the digestive system and transports them to the cells, in turn picking up the waste products for delivery to kidneys &c for ...


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WYSIWYG's comment has some good general idea: Many processes are affected by temperature including metabolism and growth rates. Reaction rates increase with temperature but not in case of catalysed reactions where the catalyst can operate at only an optimum temperature. Some related topics temperature effect on the rate of protein degradation ...


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This page (and many others) explain the idea rather well. This is more of a physics than a biology question, but the fundamental concepts are the same. In fact, contrary to what you wrote in the question, the measured blood pressure should be lower than expected if the arm is elevated above heart level. When you reduce the pressure on the bent pipe, ...


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Digitalis (which was by the way originally synthesized from Digitalis Purpurea) has two mechanisms of action: The action by which digoxin improves contractility appears to be inhibition of the sarcolemmal Na$^+$K$^+$-ATPase "pump", normally responsible for maintaining transmembrane Na$^+$ and K$^+$ gradients The major therapeutic electrical effect ...


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I'm just going to link you to another post here, which I believe answers the same question. It's because the facilitation of the transient outward current if much more prominent in epicardial regions than in endocardial regions. And the following citation, "Transient outward potassium current, ‘Ito’, phenotypes in the mammalian left ventricle: underlying ...


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Dizziness after eating, which can lead to falls and passing out, is called postprandial hypotension, and as the heart is indeed responsible for responding to hypotension by increasing it's rate - which can be seen in any number of clinical scenarios from blood loss to standing up too suddenly - failure to do so, for any reason including heart disease, can ...


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You are wrong on several accounts: Bends occur due to bubbles that form in muscles and joints and not lungs - They fall under Mild or Type 1 Decompression Sickness (Type 1 DCS). Formation of bubbles in blood stream do occur in the Decompression process - Hyperbaric chamber is used to treat this condition. What happens when diving: During deep sea diving ...



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