https://www.khanacademy.org/science/health-and-medicine/circulatory-system/heart-depolarization/v/thinking-about-heartbeats 2020-07-15T21:03:20Z Thinking about heartbeats 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. Rishi Desai video https://cdn.kastatic.org/googleusercontent/mc8rMrQ0bUlAYS5dbF-zDM19ZqB7Cj9KPBf1-OEXm266MeM0wWx7NDHMZGapgi_7F1eJPrJxV1EqdsUUZYsXwvEZ Thinking about heartbeats 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. https://cdn.kastatic.org/ka-youtube-converted/7TafYJLjhY4.mp4/7TafYJLjhY4.mp4 570 Functioning and control of heartbeat https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory-system-introduction/v/lub-dub 2020-09-09T11:23:52Z Lub dub 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. Rishi Desai video https://cdn.kastatic.org/googleusercontent/H-eK4hgL6f_a6509l4oPFD4JwZEzNoXexVyXLC19Us8P2YM3KpmzOHgFXDRY4fqToIrrhPqeIocwUN30mLsYRJjJ3g Lub dub 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. https://cdn.kastatic.org/ka-youtube-converted/-4kGMI-qQ3I.mp4/-4kGMI-qQ3I.mp4 590 Functioning and control of heartbeat https://www.khanacademy.org/science/health-and-medicine/circulatory-system/heart-depolarization/v/electrical-system-of-the-heart 2020-07-15T21:03:14Z Electrical system of the heart See where the pacemaker cells start the electrical wave of depolarization, and how it gets all the way to the ventricles of the heart. Rishi is a pediatric infectious disease physician and works at Khan Academy. Rishi Desai video https://cdn.kastatic.org/googleusercontent/4KKA0U9oZjqg_R3yYqpR08941c1FCmi-CAukk5n2RYB9Nv0l3DCAcP_KQ-ozOXYAbouN9KOzxQ1dctAzqn_rPgQ6 Electrical system of the heart See where the pacemaker cells start the electrical wave of depolarization, and how it gets all the way to the ventricles of the heart. Rishi is a pediatric infectious disease physician and works at Khan Academy. https://cdn.kastatic.org/ka-youtube-converted/7K2icszdxQc.mp4/7K2icszdxQc.mp4 583 Functioning and control of heartbeat https://www.khanacademy.org/science/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-2/x01ceb15d0be61009:untitled-599/e/cardiac-cycle-and-ecg 2026-04-07T23:55:07.30621384Z Cardiac cycle and ECG This exercise is on the nodal tissue of the heart, systole and diastole, and ECG. Moumita Sen exercise