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Glucagon

Glucagon

a polypeptide hormone (3485 D) secreted by the cells of the islets Of Langerhans in response to a fall in blood sugar levels. Induces hyperglycaemia. A family of structurally related peptides includes glucagon like peptides 1 & 2 (encoded by the same gene), gastric inhibitory polypeptide, secretin, vasoactive intestinal peptide, growth hormone releasing Factor, pituitary adenylate cyclase activating polypeptide, exendins. A hormone secreted by the pancreas; stimulates increases in blood sugar levels in the blood (thus opposing the action of insulin).A protein consisting of 29 amino acids that is produced by the islets Of Langerhans.


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Re:

... were right! Unlike what I first thought, glycolysis can't take place once glycogenolysis has started because the pyruvate kinase is inhibited by glucagon and adrenaline, so PEP can't turn into pyruvate anymore. Which is only adding to my confusion...

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by Aymeric
Sat Dec 14, 2013 11:51 pm
 
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 5863

Re:

... of the brain, red cells and other glucose dependent tissues)? So as soon as glucose shows signs of decreasing, insuline drops and is replaced by glucagon+adrenaline released into the blood, which (according to all the textbooks I've come across) are triggers for both GNG and glycogenolysis. I ...

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by Aymeric
Sat Dec 14, 2013 11:11 pm
 
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 5863

When does gluconeogenesis kick in during physical activity?

... my coursebook teaches me is that glycogenolysis is the main purveyor of energy during physical exercise, and it is triggered by LOW INSULIN, HIGH GLUCAGON and HIGH ADRENALINE, which is exactly what happens when you start working out. So far so good. But then they tell me that gluconeogenesis is ...

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by Aymeric
Fri Dec 13, 2013 10:35 am
 
Forum: Human Biology
Topic: When does gluconeogenesis kick in during physical activity?
Replies: 12
Views: 5863

Insulin Glucose Glucagon Help!

Hi, I am currently doing a research on the endocrine system. I need data on insulin glucose and glucagon levels with respect to time, i.e., the levels of these 3 stuff with respect to the time frame. I have been searching through all published litereature and online, and ...

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by Xqugh
Wed Aug 15, 2012 9:59 am
 
Forum: Molecular Biology
Topic: Insulin Glucose Glucagon Help!
Replies: 0
Views: 1278

Blood Glucose Levels

... and weight loss. A blood test reveals elevated blood glucose. What would further tests more likely reveal? A) low insulin B) Low ACTH C) Low glucagon D) Low cortisol The answer is A. But I don't understand this answer, Here is my reasoning: When a person has elevated blood glucose levels, ...

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by sportsguy131
Wed Jun 06, 2012 10:01 pm
 
Forum: General Discussion
Topic: Blood Glucose Levels
Replies: 4
Views: 4672
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