Homeostasis

Homeostasis

the maintenance of a stable environment for factors necessary for survival. EX: blood oxygen levels, body temp, caloric intake and fluid intake

Allostasis

When you get a temporary change in physiological conditions outside of that normal range to respond to immediate change in situation. EX: increased heart rate and blood pressure

Ectotherms

Derive heat primarily from their environment

Endotherms

external heat sources,

Anorexigenic hormones  

Tells you are full

Orexigenic hormones 

Hormones and signals that tell us we need to eat – signal hunger  

Hunger signals

Ghrelin (comes from the stomach) = after a meal, it goes down, increases as we go through the day  

Osmosis

Water diffusing across membranes

Isotonic

Cells are surrounded by a solution of equal osmolarity

Hypertonic

The cell is surrounded by a solution that has a higher solute concentration

Hypotonic

The cell is surrounded by a solution that has a lower solute concentration. Movement of water from outside the cell to the cytoplasm.

Eating disorders

• Anorexia nervosa • Bulimia nervosa • Binge eating disorder, epigenetics

What are the environmental influences of eating disorders?

Cultural and Gender Differences

Anorexia

5HT receptor gene and DA gene

Bullimia

Estrogen gene & Cannabinoid gene

Binge eating disorder

5HT transporter gene (responsible for encoding)