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Homeostasis/ Loops

Chapter 1 - A & P Lecture

QuestionAnswer
Homeostasis maintenance of relatively constant internal environment within the body
Feedback Loops regulate homeostasis by allowing for a process to be adjusted by the outcome
Components of Feedback Loops: receptor control center effector
Receptor monitors the value of some variable by detecting a stimulus (change in variable)
Control Center establishes the set point and receives input from the receptor
Effector generates the response which can change the value of the variable
Positive Feedback Loops - unusual in normal, healthy individuals, leads away form homeostasis and can result in death - Normal Ex: childbirth, lactation, blood clotting - Harmful Ex: after hemorrhage, blood pressure drops and the heart's ability to pump blood decreases
Negative v Positive POS: amplifies a change, pushing a system further from its starting point NEG: counteracts a change to maintain stability returning the system to a set point
 

 



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