Medicine has gone high tech. But how do the new, less invasive diagnostic tools work? An engaging short video sheds light on how integrated photonics is revolutionizing the medical sensor industry.

Salt is necessary for your diet, but too much or too little and it causes health problems. These problems, as well as what salt does in your body, are the focus of a video that also looks at where salt is found in food and how much salt...

High schoolers learn what blood pressure measures, how it becomes too high, and the effects on the body. The narrator also explains how the body can deal with high blood pressure on its own, at least for a short amount of time. 

Use the 25th video in the series of 47 to learn about the human heart, its structure, and function. The narrator teaches about the atria, ventricles, blood pressure, arteries, and veins.

Hypotension can be caused by a number of things — pregnancy, after eating a full meal of carbs, medications, and even genetics. In the video, the narrator discusses why some people become dizzy or light-headed when they stand up quickly....

As the output of foods has increased over the years, so has world-wide epidemic of obesity. However, sometimes genetics plays a role in obesity. But what about being overweight? View a video that discusses the difference between...

Carefully follow five different preload scenarios to see how each one will have a different effect on how actin and myosin line up. Rishi is a pediatric infectious disease physician and works at Khan Academy. [14:18]

Figure out how all of those physiology terms - end-systolic, end-diastolic, pulse pressure, stroke volume, and ejection fraction - can be easily understood using the pressure-volume loop. Rishi is a pediatric infectious disease physician...

Understand what is happening at the cellular level to cause two identical left ventricular volumes to have such different pressures! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Find out why stretching a heart cell in diastole affects how forcefully it contracts in systole. Rishi is a pediatric infectious disease physician and works at Khan Academy. [12:41]

Ever wonder exactly how the left ventricle's pressure changes over time? Find out in this color-coded video! Rishi is a pediatric infectious disease physician and works at Khan Academy. [10:51]

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today we'll learn how it really works. The heart's ventricles, atria, and valves create a pump that maintains both high and low pressure to circulate blood...

This short movie gives you a fun way to learn the basics of the heart and how the circulatory system works. From KidsHealth.

Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank's gonna tell you how it really works. The heart's ventricles, atria, and valves create a pump that maintains both high and low pressure to...

This article tells what it is like to have a check-up at the doctor's office. Knowing what to expect takes away your fear and worry.

Learn about two major heart problems that hypertension can cause. Rishi is a pediatric infectious disease physician and works at Khan Academy. [7:19]

Here's a chance to see if you can combine what you know to add up resistance in series AND in parallel. Rishi is a pediatric infectious disease physician and works at Khan Academy. [3:22]

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 how Dr. Korotkoff cleverly used a stethoscope to determine blood pressure, and that we still use his trick today! Rishi is a pediatric infectious disease physician and works at Khan Academy. [5:27]

Watch how PV loops can be "morphed" into PV boxes to make drawing them and thinking about them much simpler. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Understand how EA is affected by changes in preload, and in turn, how the PV loop can shift. Rishi is a pediatric infectious disease physician and works at Khan Academy.

First, learn the difference between arterial elastance (EA) and afterload. Then, understand how EA is affected by changes in afterload, and in turn, how the PV loop can shift. Rishi is a pediatric infectious disease physician and works...

Find out what happens when the left ventricle is not allowed to relax, and instead you simply add and take away blood from it. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Left ventricular volume changes over time in a way that makes a curious looking graph. Learn more in this video! Rishi is a pediatric infectious disease physician and works at Khan Academy.