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