Presentation on theme: "UNDERSTANDING FEEDBACK MECHANISMS and HOMEOSTASIS"— Presentation transcript:
1UNDERSTANDING FEEDBACK MECHANISMS and HOMEOSTASIS BY: Coach Lee
2What is homeostasis?maintenance of a stable internal state within an organism.
3What is feedback?Is a mechanism that will maintain homeostasis.
4Example of feedback mechanism in animals. Temperature homeostasis:Your body gets hot, so we sweatYour body sweats, it evaporates and we cool back off.Heart rate homeostasis:You increase the rate of excerisceThen your heart rate increases to compensate for necessary oxygen levels and blood flow
5Example of feedback mechanisms in plants: plants need to regulate water loss and carbon dioxide intake for photosynthesis and other life activities
6Feedback in plantswhen plants do not keep enough water in their cells, they wilt and dieguard cells: open and close the stomatethe ability of the guard cell to close during periods of limited water availability for the plant allows the plant to maintain water homeostasis