How does the body bring blood glucose concentration from a high level back to normal?

When blood glucose concentration rises above its optimum level of 90mg/100cm3, it is detected by β-cells in the Islets of Langerhans in the pancreas. These β-cells release insulin into the bloodstream. Insulin binds to receptors on the target cells, mainly hepatocytes (liver cells) and muscle cells. This binding causes a range of responses that increase the rate of facilitated diffusion of glucose into cells, lowering blood glucose concentration: it stimulates a change in tertiary structure of glucose transport carrier proteins in the cell surface membrane of target cells, causing them to open; it stimulates vesicles in target cells containing glucose transport carrier proteins to fuse with the cell surface membrane, increasing the number of glucose transport channels; it activates enzymes in the target cells that convert glucose into GP then glycogen, increasing the rate of glycogenesis which helps to maintain a steep concentration gradient for glucose to enter the cell down; and it activates enzymes in fat storage (brown adipose) tissue that convert glucose to fat.

EH
Answered by Emily H. Biology tutor

5135 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

The MMR vaccine gives protection against measles, mumps and rubella. How? (4 marks)


Why is it that an action potential only travels in one direction?


Why is ATP used as an energy store in cells?


What is the cardiac cycle?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences