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CH1: Obj 5+6

QuestionAnswer
Why is water important? Most abundant substance in body; environment for metabolic processes; required for transport of substances; regulates body temperature.
Why is food important? Provides necessary nutrients to supply energy.
Why is oxygen important? Releases energy from food.
What are the 3 parts of a homeostatic mechanism? Receptor, Control Center, Effector.
What is a receptor? Detects and provides information about the stimuli.
What is a control center? Decision-maker that maintains the set point.
What is an effector? Muscle or gland that responds to the control center and causes the necessary change in the internal environment.
What is negative feedback? Most common homeostatic mechanism; returns conditions toward normal range by reducing the deviation from the set point.
Why is it called negative feedback? The response moves the variable in the opposite direction of the deviation from the set point.
What does negative feedback prevent? Sudden, severe changes in the body.
What are examples of negative feedback? Body temperature and blood glucose levels.
What is positive feedback? Uncommon homeostatic mechanism; intensifies the change instead of reversing it.
How does positive feedback work? Effector activity increases initially instead of decreasing.
Is positive feedback long-lasting? No, it is short-lived.
Does positive feedback lead to homeostasis? Yes. It creates unstable conditions temporarily but ultimately leads to homeostasis.
What are examples of positive feedback? Blood clotting and uterine contractions during childbirth.
Created by: jullian18
 

 



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