endocrine system (notes)

functions: 

1. maintain homeostasis
2. respond to stimuli
3. regulate body development

• hormones (chemicals) released into body by endocrine organs to send messages through body
• glucose concentration in blood must be kept w/in constant range

-can't be too low or no glucose for cellular respiration --> weak, tired, shakey, etc.
- can't be too high bc dangerous

glucose can be stored as glycogen <--can be broken down into glucose in bloodstream by enzymes

• insulin: hormone from pancreas, released when blood sugar is too high 

-binds to muscle & fat cells to increase uptake of glucose from blood
-binds inside liver & tells it to convert glucose to glycogen