Which of the following statements correctly describes a mechanism involved in the control of blood glucose concentration?
Beta β\betaβ cells in the pancreas secrete insulin in response to a fall in blood glucose concentration below the set point.
Insulin decreases blood glucose concentration by stimulating glycogenolysis in hepatocytes.
Glucagon, secreted by alpha α\alphaα cells in the pancreas, stimulates both glycogenolysis and gluconeogenesis in liver cells.
The homeostatic regulation by insulin and glucagon ensures that blood glucose concentration remains completely constant without any fluctuation.
8 exam-style questions on OCR A A Level Biology Hormonal communication. Each one has a worked solution and a mark scheme showing where the marks go.