Which of following describes a negative feedback loop?
a) when the heart rate is too high, the body sends hormones that continually increase the heart rate higher.
b) when a pregnant women is in labor, the body sends hormones that increase the intensity of contractions, which then increase the secrection of the same hormones.
c) when the blood sugar is to low, the body sends hormones the raise blood sugar until it reaches a typical level and hormones secrection slows.
d) when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.