Final answer:
Negative feedback in hormone regulation helps maintain homeostasis by adjusting hormone production to keep levels within a controlled range; hence, the correct choice is D, where hormone levels are self-regulated to maintain homeostasis.
Step-by-step explanation:
A negative feedback system in hormone regulation refers to the process by which the body maintains homeostasis by regulating hormone levels. When the levels of a hormone rise too high, signals are sent to reduce its production, and when levels are too low, production is increased. This self-regulating mechanism ensures that hormone concentrations remain within a relatively narrow, optimal range. An example of this is the regulation of blood glucose levels: insulin is released to lower high blood glucose, while glucagon is secreted to raise low blood glucose.
Regarding the student's question on negative feedback in hormone regulation, the correct answer is: D. Hormone levels are self-regulated to maintain homeostasis.
The body uses negative feedback as a predominant mechanism to keep various physiological parameters, including hormone levels, within a desired range, preventing the excess or deficiency of hormones that could disrupt normal bodily functions.