Feedback Loop Test Prep Quiz
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A man is stuck on a life raft in the middle of the ocean.  Eventually the man is so thirsty he drinks the salty ocean water.  Drinking the ocean water makes the man urinate (pee) more, which makes him more thirsty so he drinks more ocean water which makes him urinate (pee) more. *
The scenario above is an example of a(n):
When you eat food, your body digests the food and releases glucose into your blood.  If the amount of glucose in your blood gets too high, your body releases the hormone insulin that reduces the amount of glucose in your blood.  If your blood glucose gets to low, your body releases the hormone glucagon which raises blood glucose. *
The scenario above is an example of a(n):
In men, testosterone levels are controlled by the pituitary gland.  If testosterone levels are low, the pituitary gland releases LH hormone which makes the testicles make more testosterone.  If testosterone levels get too high, the pituitary stops releasing LH and testosterone levels drop. *
The scenario above is an example of a(n):
In northern Alaska there is permafrost.  Permafrost is a layer of soil that remains frozen even in the summer.  As worldwide temperatures have risen, permafrost in Alaska has thawed which releases carbon dioxide into the air.  Increased carbon dioxide in the air causes temperatures to rise more, which thaws more permafrost. *
The scenario above is an example of a(n):
During the spring, the levels of water in the Columbia river are very high.  During the summer the levels of water in the Columbia river drop, usually hitting their lowest point in late August or early September.  Water levels will remain low until late February when water levels will rise again in the spring. *
The scenario above is an example of a(n):
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