Learn how blood flows through the heart, and understand the difference between systemic and pulmonary blood flow. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Find out how to use the PV loop to draw the Ea (Arterial Elastance) line, and what it represents. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:21]

We begin our look at how blood gets around your body. In this episode, we look at the basic three-layer structure of your blood vessels. We review how those structures differ slightly in different types of vessels. We will also follow...

This site, created as part of The New York Times series Six Killers, contains an interactive animation depicting what happens when a stroke occurs as well as how it is diagnosed.

On today's episode of Crash Course Anatomy & Physiology, Hank continues our exploration of tissues, with an introduction to your connective tissues. [10:39]

Now that we've discussed blood, we're beginning our look at how it gets around your body. Today Hank explains your blood vessels and their basic three-layer structure of your blood vessels. We're also going over how those structures...

Now that we've discussed blood, we're beginning our look at how it gets around your body. Today Hank explains your blood vessels and their basic three-layer structure of your blood vessels. We're also going over how those structures...

Get an overview of the function of the whole circulatory system by watching this video. [2:29]

Ever wonder why the heart sounds the way that it does? Opening and closing of heart valves makes the heart rhythm come alive with its lub dub beats. Rishi is a pediatric infectious disease physician and works at Khan Academy. [9:50]

Learn how the size of a tube (it's radius) is related to its resistance to something flowing through. Rishi is a pediatric infectious disease physician and works at Khan Academy. [8:53]

Learn the difference between blood flow (volume/time) and perfusion (volume/time/amount of tissue). Rishi is a pediatric infectious disease physician and works at Khan Academy. [10:31]

See how pressure, flow, and resistance relate to one another and how they each affect the human body. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:50]

See how increasing resistance in the blood vessels can cause blood pressure to rise over time. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:25]

Learn the differences between continuous, fenestrated, and discontinuous capillaries, and how they affect the movement of molecules. Rishi is a pediatric infectious disease physician and works at Khan Academy. [9:17]

Watch how the blood flows through the fetal circulation and compare it to what happens in the baby's body. Rishi is a pediatric infectious disease physician and works at Khan Academy. [11:52]

Find out exactly where the heart rests in your body and what it does. Rishi is a pediatric infectious disease physician and works at Khan Academy. [10:09]

Watch how the blood flows through the baby's circulation and compare it to what happens in the fetus. [3:25]

This video contains a very detailed drawing of the heart to explain blood flow. [9:47]

Learn about rare heart defect, truncus arteriosus. [3:22]