Define negative feedback, give two examples of it, and explain its importance to homeostasis.
Define positive feedback and give two examples of its beneficial and harmful effects.
Ellen is pregnant and tells Janet, one of her coworkers, that she is scheduled to get a fetal sonogram. Janet expresses alarm and warns Ellen about the danger of exposing a fetus to X-rays. Discuss why you think Janet’s concern is warranted or unwarranted.