HLTB22H3 Chapter Notes - Chapter 1: Adenylyl Cyclase, Protein Kinase, Insulin Receptor

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8 Dec 2016
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The endocrine system is one of the two major control systems of the body. The endocrine system->interacts with the nervous system to coordinate and integrate the activity of body cells. The nervous system regulates the activity of muscles and glands via electrochemical impulses delivered by neurons and those organs respond within milliseconds. The means of control and the speed of the endocrine system are very different. The endocrine system influences metabolic activity by means of hormones. Hormone: hormones are chemical messengers secreted by cells into the extracellular fluids. These messengers travel through the blood and regulate the metabolic function of other cells in the body. Binding a hormone to cellular receptors initiates responses that typically occur after a lag period of seconds or even days. But once initiated, those responses tent to last much longer that those induced by the nervous systems. Hormones target most cells of the body, producing diverse effects.

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