Which of the following describes a positive feedback loop?
A. When blood sugar concentration is too low, the endocrine system secretes hormones that increase blood sugar concentration to a normal level.
B. When the body senses that the heart rate is very high, it secretes hormones that decrease the heart rate.
C. When blood sugar concentration is too high, the endocrine system secretes hormones that decrease blood sugar concentration to a normal level.
D. When someone is exercising intensely, the body secretes hormones that increase oxygen supply for cellular respiration.
Answers: 3
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The picture below shows president richard nixon and the first lady standing before the great wall of china in 1972. they are smiling - as are the chinese with them. when this picture was shown on american television, americans were aware that it was a historic moment. what are two reasons why this moment was important for both china and the united states?
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Which of the following describes a positive feedback loop?
A. When blood sugar concentration is too...
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