Biological Flashcards
What does homeostasis need to be kept at and why? (Biological eating)
Equilibrium to enable the body to function at optimum
What is the hypothalamus divided into? (Biological eating)
The lateral hypothalamus and the ventromedial hypothalamus
What is the LH turned on by? (Biological eating)
Low glucose levels, releasing hunger signals
What did Anad and Brobeck (1951) find? (Biological eating)
When the LH is damaged there is a loss of appetite (alphagia)
What did Sakurai (1998) find? (Biological eating)
When the LH is damaged there are thirst and sex defects
What is the VMH turned on by? (Biological eating)
High levels of glucose, feelings of satiety, thus we stop eating
What did Hetherington (1942) find? (Biological eating)
Rats with a damaged VMH dramatically over ate and became obese
What did Gold (1973) find? (Biological eating)
Areas alongside the VMH had to be damaged in order for the rats to overeat
Why are Gold (1973) findings subjective? (Biological eating)
His findings were never replicated
What is the role of leptin? (Biological eating)
Released by fat cells, detected by the VMH that make us stop eating
What is the role of ghrelin? (Biological eating)
Released into the stomach, detected by the LH and initiates eating
What is Zhang (1994) research on leptin? (Biological eating)
Some mice her a predisposition to obesity. Ob/ob mice overeat because they have no leptin hormone
What is Wren et al research on ghrelin? (Biological eating)
Gave rats injections of ghrelin and the was an increase in food intake
What is the amygdala responsible for? (Biological eating)
Food selection based on previous experiences and emotional responses
What did Rolls and Rolls (1973) find? (Biological eating)
When the amygdala was removed from rats, they would eat novel food items e.g the cage
