See how Atherosclerosis (fat in the blood vessel wall) hardens the arterial wall and makes it harder for blood to flow through. Rishi is a pediatric infectious disease physician and works at Khan Academy. [8:59]

See how ADH acts on blood vessels and the kidney to raise blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy. [9:33]

Learn about treatments for aneurysms. [11:53]

Listen to a discussion on aortic stenosis and aortic regurgitation. [12:06]

Learn about a treatment for aortic dissection. [9:02]

Patent ductus arteriosus is a medical condition where a blood vessel called the ductus arteriosus does not permanently close after birth. Learn why the ductus arteriosus does not close, why patients with this condition have a wide pulse...

This video lesson from Khan Academy provides information about strokes, one type of circulatory system disease. Students will learn basic information the ischemic core and penumbra.

This video lesson from Khan Academy provides information about strokes, one type of circulatory system disease. Students will learn basic information about hemorrhagic strokes.

A video showing an animation of how the one-way valves in veins work to push blood towards the heart. [0:19]