MIT biologist, Dr. Nathaniel Schafheimer answers the question, "Could we engineer ourselves to need less oxygen someday?" [2:58]

Learn about hemoglobin and its role in the circulatory system.

Take a close look at how some friendly competition for Hemoglobin allows the body to more efficiently move oxygen and carbon Dioxide around. Rishi is a pediatric infectious disease physician and works at Khan Academy. [13:53]

Learn the two ways that oxygen moves from the lungs to the tissues, and the three ways that carbon dioxide returns from the tissues to the lungs. Rishi is a pediatric infectious disease physician and works at Khan Academy.

A narrated tutorial describing the role that hemoglobin plays in transporting oxygen in the blood. [3:36]

A narrated lesson examining the structure, function, and production of new red blood cells. [5:20]

Take a close look at how some friendly competition for Hemoglobin allows the body to more efficiently move oxygen and carbon Dioxide around. [13:53]

This video explains why cells need oxygen and what happens when cells do not receive oxygen resulting in shock. This video also describes the different types of shock. [9:07]