Find out exactly how your autonomic nervous system has a chronotropic effect (i.e. timing) that changes the speed of your heartbeat! Rishi is a pediatric infectious disease physician and works at Khan Academy. [12:02]

Understand the cardio disorder of atrial flutter. [3:56]

Understand the heart condition ventricle fibrillation. [8:48]

Find out how the various pacemaker cells in the heart actually race against the clock to try to keep pace for the heart. Also understnad how the heart has not one but two back up systems! [13:25]

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]

Find out what happens when things move very slowly through the AV Node. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Twenty percent of all premature babies contract serious infections while in the hospital. By harnessing millions of heartbeat measurements from the ICU each day, Dr. Carolyn McGregor found she could detect a baby's infection at least one...

Figure out how all of those physiology terms: end-systolic, end-diastolic, pulse pressure, stroke volume, and ejection fraction, can be easily figured out using the pressure-volume loop. [9:18]