Which of the following is an example of positive feedback in the lumen of the stomach?
- chief cells secrete pepsinogen, which is a precursor to pepsin.
- pepsin digests molecules of pepsinogen, producing more pepsin.
- pepsin works best in the acidic environment produced by hydrochloric acid.
- hydrochloric acid converts pepsinogen to pepsin.

Meg is moderately active and completes 30minutes of daily activity above the baseline level. based on the chart, which activity will not increase megs physical fitness?

A72-year-old woman fell in her bathtub and fractured her hip. in viewing the fracture, x-ray revealed osteoporotic changes in her bone as well. after reduction of the fracture, and immobilizing the bones with internal pins, what type of exercise would the doctor have advised her to do as soon as she was able in addition to prescribing calcium supplements to improve her bone mass?

Early treatment for mental illness involved because doctors believed that doing this would drain the mental illness out of the person’s body.