BIO FINAL - Josephine Do Sata Gayani BIO FINAL 2 Just as we...

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Josephine Do 5/13/11 Sata/ Gayani BIO FINAL 2.] Just as we receive and act on signals from our environment, our cells also receive and act on signals from their environment- our bodies. This is a necessary biological occurrence that keeps cells alive and functioning. Insulin is a hormone released by our pancreas that signals cells in a specific way in order to stimulate them to take in, use and store glucose and is a major hormone controlling critical energy functions such as glucose and lipid metabolism. After ingesting food, your meal is broken down and digested. As a result, glucose is released into your bloodstream. High concentrations of glucose in the blood are a signal for the beta cells of the pancreas to release insulin. This hormone works like a key to unlock the protective cell membranes and allow the passage of glucose into the cell to be used for energy. Insulin works to decrease the concentration of glucose in the blood and facilitate transport into the cells by binding to special receptors embedded in their membranes. Although there are some tissues such as the brain and the liver that do not require insulin for glucose uptake, most of our cells would not be able to access blood glucose without it. Glucose is the energy source for all cells and is required for their, and ultimately our, survival. The insulin signaling pathway includes an insulin receptor that is made up of two receptor
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This note was uploaded on 04/04/2012 for the course ECO 304K taught by Professor Hickenbottom during the Spring '10 term at University of Texas.

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BIO FINAL - Josephine Do Sata Gayani BIO FINAL 2 Just as we...

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