The image below shows how the human body and the endocrine system controls the level of blood sugar.
b)
- Using the diagram above, describe the differences between positive and negative feedback.
Human blood sugar level is controlled by an endocrine organ called pancreas
Negative feedback mechanism
When an animal has eaten, blood glucose level rise, which is sensed by the nervous system. Specialized cells in the pancreas sense the increase , releasing the hormone insulin. Insulin causes blood glucose level to decrease , as would be expected in a negative feedback system. However if the animal has not eaten and blood glucose level decreases, this is sensed in a different group of cells in the pancreas; the hormone glucagon is released, causing glucose level to increase
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