This figure is a simplified negative-feedback loop used by a pharmacist to explain blood glucose control to a patient. The patient has eaten a meal containi...
Question 1 Report
This figure is a simplified negative-feedback loop used by a pharmacist to explain blood glucose control to a patient. The patient has eaten a meal containing rice, so glucose has been absorbed from the small intestine into the blood. The pharmacist asks the patient to complete the missing parts of the sequence. A rise in blood glucose concentration is detected by the pancreas. Insulin is then released. The response includes glucose uptake by body cells and conversion of glucose to glycogen in the liver. These responses should reduce the original rise.
(a) Identify the organ that releases insulin. [1]
(b) Use the figure to state two effects of insulin on glucose in the body. [2]
(c) Explain why insulin secretion decreases once blood glucose concentration returns to normal. [2]
(d) Give two reasons why a person needs a controlled supply of glucose in blood. [2]
Answer Details
(a) Pancreas [1] (b) Any two: body cells take up glucose from blood [1]; liver/muscle cells convert glucose to glycogen [1]; blood glucose concentration falls [1] (c) The blood glucose concentration is no longer above the normal level [1]; less insulin prevents it falling too far/maintains the normal range [1] (d) Any two: glucose is needed for respiration [1]; respiration supplies energy for body processes [1]; brain cells need a reliable glucose supply [1]
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