Homeostasis Notes PDF

Homeostasis  Definition Homeostasis: Maintaining the internal environment of the body constant despite the change in the external environment.  Each body condition must be kept constant at its optimum value to maintain normal functioning. But if any of these conditions change, the body qu...

Homeostasis  Definition Homeostasis: Maintaining the internal environment of the body constant despite the change in the external environment.  Each body condition must be kept constant at its optimum value to maintain normal functioning. But if any of these conditions change, the body quickly returns back to its normal state by undergoing some responsive changes to reach homeostasis by negative feedback mechanism.  Examples 1-Blood glucose level 2-Calcium level in the blood 3-Water and electrolytes 4-Gases in the blood 5-Body temperature 6-pH of the blood Regulation of calcium level in the blood Acid- base homeostasis Body temperature regulation Blood glucose regulation Homeostasis of water in the human body Control systems maintain hoemostsis These system detect and respond to changes in internal environment Components of control system: Stimulus-Receptor-Afferent-Center- Efferent-Effector organ-Feedback mechanism Types of feedback mechanism: 1-Negative feed back mechanism: Decreases the action of the control system. Change the variable back to its ideal value. All most all mechanism : hormones  2-Positive feedback mechanism Progressive increase in the response. Accelerate the process. Must be completed rapidly. Such as: Uterine contraction during delivery Blood clotting.