MYTUTOR SUBJECT ANSWERS

222 views

How are blood glucose levels controlled in the body?

When there is an excess of glucose in the blood (as there would be after eating a meal), the increase in blood glucose concentration is detected by the beta cells of the islets of Langerhans in the pancreas. They respond by increasing the secretions of the hormone insulin.

Insulin will increase the rate of glucose uptake by activating enzymes that convert glucose to glycogen, so blood glucose levels will lower and return to normal. This process is called glycogenesis.

Low blood glucose levels are detected by alpha cells of the islets of Langerhans of the pancreas. These cells will respond by increasing the secretions of glucagon into the blood.

Glucagon is a hormone that will activate enzymes in the liver, these enzymes will convert glycogen to glucose in a process called glycogenolysis. Glucagon will also stimulate formation of new glucose molecules in a process called gluconeogenesis. As more glucose is synthesised and released into the blood, the blood glucose levels will return to normal.

This system is controlled by negative feedback, once blood glucose concentrations have returned back to the normal level, the receptors involved will detect this and stop secreting excessive amounts of hormone (insulin or glucagon).

This process provides homeostasis; the maintainance of a constant internal environment and independance of fluctuating external conditions. Homeostasis is achieved by negative feedback.

Elizabeth T. A Level Biology tutor, GCSE Biology tutor, GCSE History ...

9 months ago

Answered by Elizabeth, an A Level Biology tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

132 SUBJECT SPECIALISTS

£26 /hr

Osama H.

Degree: Medicine (MBBS/BSc) (Bachelors) - Imperial College London University

Subjects offered: Biology, Geography+ 4 more

Biology
Geography
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-

“Hi I'm Osama, a medical student at Imperial College London. I'm happy to help with core subjects at GCSE, and Biology and Chemistry and A-level. I am also happy to help you get that coveted place at medical school!”

£20 /hr

Shoam B.

Degree: Medicine (Bachelors) - Sheffield University

Subjects offered: Biology, -Medical School Preparation-

Biology
-Medical School Preparation-

“Hi! My name is Sho and I'm a first year medical student at Sheffield university. Getting into Medicine was tough and I really worked hard at school to make sure I understood the core principles of what was taught. I offer A-level Bio...”

£20 /hr

Lewis M.

Degree: Biology (Masters) - Bristol University

Subjects offered: Biology, Maths

Biology
Maths

“About Me: I am a Biology student at Bristol University. I have always loved science and maths and I hope this will come across in my sessions! I have been invloved with tutoring for the majority of my school life, taking time out of ...”

MyTutor guarantee

About the author

£20 /hr

Elizabeth T.

Degree: Biomedical Science (Bachelors) - Newcastle University

Subjects offered: Biology, Chemistry

Biology
Chemistry

“A Little Bit About Lizzie: I am a Biomedical Science student studying at Newcastle University. I recieved grade A's in Biology, Chemistry and Maths at A-level, and have always had a real passion for science! I am patient and have a v...”

You may also like...

Other A Level Biology questions

What is an enzyme?

What are the different phases of the cell cycle?

How are blood glucose levels regulated in humans?

Explain how an impulse is transmitted between nerve cells.

View A Level Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok