Hormonal mechanisms to eating Flashcards
What are hormones
Body’s chemicals messages
Travel in the blood stream to organs
What are the main three sugar hormones
Glucose
Glucagon
Glycogen
What is glucose
Sugar in the blood and main source of energy
What is glucagon
Is the hormone that tuns glycogen to glucose
What is glycogen
Where the glucose is stored
What is the role of insulin
Insulin stored in liver
Released from the pancreas
Converts glucagon to glucose
What is leptin
Hormone in fat cells , more fat stored is more lepton released
Triggers person to stop eating body feels full
What is ghrelin
Released when stomach is empty and need for food required
Longer we go without food more ghrelin is released
Cummings et al research
Food eaten stomach wall stretches reduces amount of ghrelin released
Role of the hypothalamus
Complex
Neuropeptides are minute proteins - chemicals messengers
Hypothalamus detects drop in lepton levels and generates sensation of hunger
A03: research support
Shiiya et al
Ghrelin levels lower in obesity patients than anorexia patients
Obese patients less likely to be hungry where anorexia most likely to be hungry
A03 : oversimplified
Other biological elements may play a role
Cholecystokinin (CCK) more powerful at suppressing appetite than leptin
A03: starvation signal
Main function may not be satiety
Starvation signal instead when leptin levels are depleted
Helps maintain fat stores while food is scarce
Evolutionary property’s
