Appetite Flashcards
Define appetite?
Desire to eat food
Define hunger?
Physical need to eat
Accompanied with signs like stomach grumbling, light headedness
What is anorexia?
Lack of appetite
What is satiety?
Feeling of fullness, disappearance of hunger and appetite after a meal
How do you calculate BMI?
Weight / height squared
What is orexia?
Increased appetite
What is the main centre of appetite regulation in the body?
The hypothalamus
Why do people who are depressed often change their eating habits?
There is a problem with the brain in depression
Processes from the limbic system and cerebral cortex project onto the hypothalamus, modifying appetite
Name some orexigenic molecules?
Increase appetite
Grehlin
Catecholamines
Name some anorexigenic molecules?
Leptin
Insulin
Serotonin
Peptide YY
What does leptin do?
The satiety hormone!
Switches off appetite
What does secretin do in relation to appetite?
When acids reach the small intestine, cells there release it
Produces pancreatic fluid, enhances cholecystokinin
What does cholecystokinin do in relation to appetite?
Released when protein and fat enter the small intestine
Secretion enhanced by secretin
Signals pancreas to produce insulin
Stimulates gallbladder contraction
Triggers satiety in brain
What does somatostatin do?
Released between meals to reduce digestive activity
Secreted by stomach, intestine, pancreas
Slows gastric emptying
Reduces GI muscle contractions
Reduces blood flow to gut
What does peptide YY do in relation to appetite?
Released in hours following a meal
Supress appetite
