Can someone please explain the controlling blood sugar levels in homeostasis?
I've got written in my notes that 'Pancreas produces insulin and liver does something to get glycogen.' I don't understand what the liver does in all of this. Also could you explain the procedure of when sugar levels fall.
P.S- only GCSE level required, exam on Monday, eeek!
Homeostasis is the maintenance of a stable internal environment. In terms of blood sugar, when there is high blood sugar, the pancreas secretes the hormone insulin from its beta cells. Insulin increases the ability of the cells to take up glucose from the blood. This hormone in turn, causes excess blood sugar or glucose to be stored as glycogen in the liver and muscles. Glycogen is also known as animal starch. When the blood sugar becomes too low, the alpha cells of the pancreas release glucagon a hormone with the opposite effect of insulin. This hormone causes the liver to release glucose back into the bloodstream, from the stored glycogen reserve. As long as a person does not have diabetes, this is constantly going in inside the body to maintain homeostasis.
When you consume calories the blood glucose level starts to rise almost immediately. Because the body wants to maintain a normal and constant level of glucose in the blood the pancreas senses the intake of calories and releases insulin from the beta cells to lower the glucose level. Insulin is a hormone that lowers blood glucose levels. Alternatively, when the body needs glucose, like during asleep, the alpha cells of the pancreas secrete a hormone called glucagon. Glucagon raises the blood glucose concentration.This return to normal is how the body maintains homeostasis. Homeostasis is a concept that means maintaing a relatively constant internal biochemical environment. Excess calories that you don't need at the moment are stored in the liver and muscle tissue as glycogen.