Question

Which of the following is the best example of homeostasis in the human body?

A. The secretions from oil glands in the skin decrease as a person ages.
B. Opposite muscles are used to bend and extend a person 's arm at the elbow joint.
C. The villi of the small intestine increase the absorption of nutrients from the small intestine into the blood.
D. More growth hormone is released from the pituitary gland when the level of growth hormone in the blood falls too low.

Please explain why your answer is correct.

Answer 1

The best example of homeostasis is the release of growth hormone from the pituitary gland in response to low levels, which is a negative feedback loop. So the correct option is D.

Step-by-step explanation:

The best example of homeostasis in the human body from the provided options is D. More growth hormone is released from the pituitary gland when the level of growth hormone in the blood falls too low. Homeostasis refers to the maintenance of a stable internal environment in the body. The release of growth hormone from the pituitary gland is a classic example of a negative feedback loop, where the body senses a deviation from a set point (low growth hormone level) and responds to correct it by releasing more growth hormone. This action then brings the level of growth hormone back towards the set point, demonstrating homeostatic control.

Regarding the other options, A describes a non-regulatory change that results from aging rather than a homeostatic process. B describes muscle function and coordination, not homeostatic regulation. C refers to the function of the villi to absorb nutrients, which is a physiological role, but not specifically a regulatory mechanism responding to a homeostatic imbalance.

Answer 2

Homeostasis refer to the metabolic balance being maintained by several processes. It may include having a stable internal physiologic condition such as the blood ph or body temperature. Among the options, the best answer would be c. the villi of the small intestine would increase the absorption of nutrients from small intestine to the blood.