Pancreas+Researcher+1

Put your name here: Alexis Shea :3

You and your group will be responsible for putting together a defensive presentation of an endocrine gland. You and your group will be giving this presentation during class. Your presentation must include: · A picture(s) of the gland showing its shape and location in the human body. · The hormone(s) produced by your endocrine gland. · The stimulus that tells your gland to produce hormones. · The control mechanism that tells your gland to stop producing hormones. · The function(s) of the hormone(s) produced by your gland. What are the target organs/cells and how does the message carried by the hormone help maintain homeostasis. **This is probably the most important part of your presentation.**
 * Task:**

These pictures are pretty. :3



This information wont be use anyway. :3 The normal blood glucose level is 80 to 100 mg /100 ml of blood. This range is very essential for normal metabolism. Though several organs are involved in maintaining a constant blood sugar level, liver and pancreas play a central role in controlling the blood glucose level. > Role of liver in homeostasis : Liver helps maintaining blood sugar level by two processes. • Glycogenesis* : It is the process of transformation of excess of glucose into glycogen. • Glycogenolysis* : It is the process of breakdown of glycogen into glucose. It occurs when blood glucose level falls below normal. > Role of pancreas in homeostasis :The endocrine part of the pancreas secretes two important hormones namely insulin and glucagon which play a vital role in sugar metabolism. • In the presence of insulin, the cells of our body become permeable to glucose and liver cells absorb excess of glucose from the blood and convert it into glycogen (glycogenesis). • In the presence of glucagon the liver cells reconvert glycogen into glucose and release it to the blood (glycogenolysis).

An example to illustrate homeostasis- through negative feed back
The regulation of blood glucose level is a classical example of homeostasis. Following is the mechanism of regulation • After a meal, the blood in the intestinal capillaries contains high concentration of glucose (hyperglycaemia).much higher than that is found in the circulatory system. • The high blood glucose level will stimulate the beta cells of the pancreas to release insulin into the blood. • In the presence of insulin body cells take up glucose. As this blood enters the liver through the portal vein, the liver removes most of the excess glucose, converting it into glycogen (glycogenesis). If the liver has stored its capacity of glycogen, it converts the glucose into fat (lipogenesis), which is then stored in the various regions of the body as adipose tissue. • As a result of conversion, the blood glucose level declines. The decline in the blood glucose level will diminish the release of insulin. Thus, maintaining the normal blood glucose level. • After skipping a meal the blood glucose level declines (hypoglycaemia). This stimulates the alpha cells of the pancreas to release glucagon into the blood • In the presence of glucagon, liver breaks down the glycogen (glycogenolysis) and releases the glucose into the blood.

=**HELLO! It is Rachel, go on my page and look at the presentation I've started on. Please work on it, and save is and delete the old file. Thank you!**=