Why would a person, even one that is not interested in "buffing" up want to maintain good muscle tone?

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

What best describes the structure of the declaration of independence?

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels