In this episode, they describe the process of ventilation and gas exchange and the bodily adaptations that support these processes.

This video explains how mechanical and chemical digestion break food down and how the small intestine’s adaptations increase surface area to speed up absorption into the bloodstream.

Sameena Zahoor, MD, is board-certified in family medicine and works at the Hope Clinic, which provides free primary medical care to uninsured and under-insured patients, as a physician. The appendix ...