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effect of sympathetic hormones on circulation lab

effect of sympathetic hormones on circulation lab - muscles...

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Josh Young 5/05/08 Endocrinology Lab Linda Malmgren Lab Report: Effect of Sympathetic Hormones on Circulation Introduction: Sympathetic hormones originate from chromaffin tissue. There are two cell types that have been identified within the chromaffin tissue: A cells, which store adrenaline (epinephrine), and N cells, which store noradrenaline (norepinephrine). Sympathoadrenal hormones are tissues specific, as they bind only to specific receptors. Typically, alpha receptors cause contraction of smooth muscle and beta receptors cause relaxation of smooth muscle. Epinephrine has known effects relating to blood supply and circulation such as: increase in cardiac output and redirection of blood supply, which is what this lab considers. In this redirection, vessels supplying structures not involved in muscle activity such as skin, mucous membranes, and viscera, are constricted. This is because these tissues have a lot of alpha receptors. Blood is directed to vessels supplying skeletal
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Unformatted text preview: muscles with oxygen and fuel supplies, and also carry off carbon dioxide. This is because these skeletal muscle tissues have a lot of beta receptors. This removal of carbon dioxide and lactic acid waste delays fatigue in muscles and also brings lactic acid back to the liver where it serves as a substrate for gluconeogenic production of new glucose molecules which can return to the muscles in use as a new fuel supply. With the introduction of adrenaline it would be expected that one would be able to observe changes in blood flow in skin tissue, specifically the decline of blood flow. This is the goal of this lab, to observe the reaction that occurs. Procedure: (see attached) Discussion: Under microscope, we indeed saw a drastic decrease of the speed and frequency of blood cell movement in the fin of the gold fish. This was the adrenaline acting on the alpha receptors in the fin tissue, (think skin tissue), and thus the blood being redirected away, towards skeletal muscle....
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