Science Unit 4

homeoasis

Definition of homeostasis

maintaining a stable internal environment in the body, keeps things like temperature, blood sugar, and water levels constant.

Stimulus

a change in the body

Set point

normal level (ex: 37°C body temp)

Deviation

when conditions move away from normal

Enzymes

Enzymes are proteins that control reactions, work best at optimum temperature (~37°C)

What happens when body is at high temp

denaturation (shape changes, stops working)

What happens when body is at low temp

reactions slow down

Negative Feedback

Brings the body back to the set point (normal)

Positive Feedback

Enhances the change until the process is complete.

What does the receptor do

detects change

What does the control center do

processes info (usually brain)

what does the effector do

carries out response

what does the hypothalamus (brain) do

controls temperature (acts like a thermostat)

what does the skin do

sweating and heat loss

what do the kidneys do

control water balance (osmoregulation)

what does the liver do

controls glucose levels