What action illustrates how a negative feedback mechanism reduces body temperature?
a. Smooth muscles in blood vessels constrict to heighten performance.
b. Skeletal muscles in the chest slow to decrease the rate of breathing.
c. Endocrine glands increase secretion of hormones to stimulate activity.
d. Sweat glands secrete more sweat to cool the body as it evaporates.
e. Sensory receptors signal the brain to increase hormone activity.