Grade 12 University

Positive Feedback

-It's like when people over-react to something, potive feedback is when a small effect=amplified

-It sucks because it hurts!

Examples:

Human Birth Progesterone is released which releases lots of oxytocin until the baby is out

Platelets You cut your finger and it's bleeding so when blood clots form, more platelets are activated

Lactation Breastfeeding: more baby sucks more milk made

Estrogen @Follicular Phase: makes uterine lining thick

 

Negative Feedback

=preferred system

- It activates when it is needed and once things are better it stops 

Example:

Thermostat It's set to 28 degrees but then it goes down so it's activated to make it warm again.  Once it's 28 again, it stops.