For example after doing exercise it is common that your blood glucose concentration would fall as the glucose would have been used up in respiration to provide energy.
This drop in blood glucose is detected by a-cells in the Islet of Langerhans, and therefore in response they secrete the hormone glucagon, which uses hepatocytes as target cells.
Glucagon binds to the receptors on target cells, which activates adenyl cyclase which then produces cAMP. The cAMP triggers the reactions, for example:
- the polymer glycogen is broken down into glucose monomers (glycogenolysis)
- more fatty acids are used in respiration
- amino acids and lipids are converted into glucose by gluconeogenesis
The overall effects of glycogenolysis and gluconeogenesis is to release more glucose in the blood, so that the concentration is increased.
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