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Positive and Negative Feedback (Quiz 2)

What is the difference between positive and negative feedback? Many molecular and physiological processes are controlled by feedback mechanisms. In a feedback loop the product of a process, such as the breakdown of proteins into amino acids, has an effect on the rate of the process. Negative feedback occurs when the rate of the process decreases as the concentration of the product increases. Positive feedback occurs when the rate of a process increases as the concentration of the product increases. Negative feedback controls the rate of a process to avoid accumulation of a product. The rate of a process will continuously accelerate under positive feedback as long as substrate is available and the product is not consumed by some other process.

View the animation below, then complete the quiz to test your knowledge of the concept.






1Before ovulation, small amounts of estrogen are released by...
A)the ovaries.
B)the corpus luteum.
C)the anterior pituitary.
D)the hypothalamus.
E)the anterior pituitary and the hypothalamus.



2This stimulates the release of GnRH from...
A)the ovaries.
B)the corpus luteum.
C)the anterior pituitary.
D)the hypothalamus.
E)the anterior pituitary and the hypothalamus.



3After ovulation, progesterone is produced by...
A)the ovaries.
B)the corpus luteum.
C)the anterior pituitary.
D)the hypothalamus.
E)the anterior pituitary and the hypothalamus.



4Progesterone has a negative-feedback effect on GnRH and LH.
A)True
B)False



5Estrogen has a positive-feedback effect on GnRH and LH.
A)True
B)False







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