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Opposes or negates stimulus
Positive Feedback
Enhances or triggers stimilus
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Increased pressure in the aorta triggers mechanism to lower blood pressure
{Key word: lower}
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Negative or Positive Feedback?
A rise in blood calcium levels triggers the release of a hormone that lowers blood calcium levels.
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A rise in estrogen during the menstrual cycle increase the number of progesterone receptors in the uterus.
{Key word: increase}
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Uterine contractions during childbirth (contraction UNTIL babies out/no more stimulus)
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Increased blood sugar stimulates the release of a hormone from the pancreas that stimulates the liver to store blood sugar
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Blood clot formation (amplifies chemicals in the clot promote further clotting UNTIL it's sealed)
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Milk production (as long as baby is nursing. milk will be produced UNTIL babies done)
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Fever (virus/bacteria, body heats self to get rid of it UNTIL the enemy destroyed)
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The ballcock in a toilet rises as the water rises, and then it closes a valve that turns off the water.
Negative Feedback
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Production of human red blood cells (erythropoiesis) - A decrease in oxygen is detected by the kidneys and they secrete erythropoietin. This hormone stimulates the production of red blood cells
Negative or Positive Feedback?
Negative or Positive Feedback?
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Note 
Flashcard (92)