1. Which of the following best illustrates the concept of positive feedback? a) The secretion of…

1. Which of the following best illustrates the concept
of positive feedback?

a) The secretion of acid by cells in the stomach
lining is suppressed when the acidity of the stomach contents increases.

b) A rise in blood pressure stimulates the
elimination of water in the urine, which reduces the blood pressure.

c) An increase in the concentration of H+ in
blood causes an increase in H+ excretion in
urine.

d) An increase in the carbon dioxide concentration
of the blood stimulates breathing, which increases the rate at which carbon
dioxide is eliminated from the body.

e) Contractions of

1. Which of the following best illustrates the concept
of positive feedback?

a) The secretion of acid by cells in the stomach
lining is suppressed when the acidity of the stomach contents increases.

b) A rise in blood pressure stimulates the
elimination of water in the urine, which reduces the blood pressure.

c) An increase in the concentration of H+ in
blood causes an increase in H+ excretion in
urine.

d) An increase in the carbon dioxide concentration
of the blood stimulates breathing, which increases the rate at which carbon
dioxide is eliminated from the body.

e) Contractions of the uterus push the fetus against
the cervix, which triggers release of oxytocin into the bloodstream; oxytocin
then stimulates stronger contractions of the uterus.

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