25 thoughts on “Lub Dub | Circulatory system physiology | NCLEX-RN | Khan Academy”

  1. Among the best and useful bio videos i've ever seen to be used in High school. I use them in all my classes. Congrats!!

  2. Thanks for the video, it was really helpful!
    My only comment is that the sound that is heard during auscultation is not actually due to the closure of the valves, but what we are hearing is the vibration of blood along the walls and major vessels of the heart. From what my professor taught us, the actual closure of the valve leaflets causes almost no sound. Many thanks for all your videos!
    – A vet student

  3. Let's fire all the teachers make everything online, we will learn everything more efficiently faster and better.Current education system is a failure of an older generation.

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