Question

homeostatis in animals typically takes the form of negative feedback. why is the word "negative" used here ?

Answer 1

Answer- Homeostasis is regulated by a negative feedback. A negative feedback serves to reduce an excessive response and keep a variable within the normal range. Examples- control of blood glucose.

In the control of the blood glucose lei certain endocrine cells in the pancreas called alpha and beta cells, detect the level of glucose in the blood. Then they respond appropriately to keep the level of blood glucose within the normal range.

If the blood glucose level rises above the normal range, the beta cells of pancreas releases the insulin into the blood, which takes up the excess glucose from the blood until the level of blood glucose decreases to the normal range. If the blood glucose level falls below the normal range, the alpha cells of pancreas releases the glucagon into the blood. The Glucagon, then breaks down stored glycogen to glucose and release the glucose into the blood until the level of blood glucose increases to the normal level.