86 comments

  1. Hi thanks for your videos they re so useful 🙂 ..I have a question is the mitral valve,the sae as the bicuspid valve if not what does that do? thanks

  2. Nope, the mitral valves are between the atria and ventricles. The semilunar valves (there are two) separate the right ventricle and pulmonary artery, and the left ventricle and aorta. Hope this helps

  3. My bad. Still, they're not called the semilunar valves. We just refer to them at the left and right AV, so sometimes I fuck up the naming

  4. So is it possible for the Cordae Tendinae to break? And if so, if the blood flow goes the wrong directions, then what would happen?

  5. Great question. This can result in a valve that doesn't work properly and flops back and forth instead of providing a good seal. Blood can go the wrong way in this situation and lead to less efficient pumping of blood to the body.

  6. You are a LIFE SAVER! I have the worst A&P II professor in the entire world. You explain so clearly. Where have you been all my life?

  7. No…

    Atrio-Ventricular valves = Tricuspid and Bicuspid (a.k.a Mitral) Valves

    Semi-Lunar valves = Pulmonary and Aortic Valves

  8. Rishi, you are a gifted teacher. Are you considering more advanced medical presentations for those of us with the background already?

  9. Nursing Student…question… Cardiac Tamponade…does the blood fill in the gap of the Perimetrium? Thx Khan…I used your videos for Chemistry 101 also.

  10. I AM FROM Bangladesh,you better come and visit us and check it out how you are helping us.thank you very much.

  11. Thank you so much! I am a paramedic student and was wondering if you have a video on simplifying EKG's. You are a great teacher and really thank you for taking your time to post these!

  12. This video is so much clearer than the lecture given by the professors at my university. They try to sound overly formal, which only gets in the way of what they're trying to communicate. Thank you so much!

  13. Hey guys. Great vid.

    My dad was formerly a fatty. He revitalized his body from 293lbs of fat into 212 lbs of massive muscle. I couldn't believe it! I just subscribed myself because I wanna strengthen. He made use of the Muscle Building Bible (Google it)…

  14. Thank you so much for this video. You explained the layers of the heart and the intraventicular septum better than my teacher. Thanks

  15. I just hit a gold mine finding your channel. You will help me conquer my human anatomy course. Thank you!

  16. i can not say it enough! your channel has changed my life! you helped conquer physiology  and now my anatomy class! 

  17. Excellent video!! I think all Khan Academy videos are great!! They are getting me through A&P!! Thank You

  18. How thick is each layer? Is it on a cellular level because I remember hearing you say the red blood cells bump the endocardium.

  19. thank you i really really thank you from the deep of my heart …. you do know how much this vedio help me out…… we really appreciate what you are doing….

  20. Can we all take a moment to be wow'd at his writing skills with his mouse?! I don't know about you people, but my mouse writing is not nearly that legible 😛

  21. The paricardial sac that I have heard of before is just in between the two layers of the pericardium?

  22. The structure that he labeled as pericardium is actually only a part of it, called the serous pericardium. There is one more layer of dense connective tissue on the outside, called the fibrous pericardium that has been omitted. Please upvote and/or comment to this so that others can see it.

  23. Hello,

    I noticed at time (7:16–7:20), right after you finished talking about the endocardium layer, you mentioned that you go deeper into the myocardium.

    I think that was a mistake.

    From superficial to deep, the tissues should go as follows: Pericardium, Myocardium, and Endocardium.

    Therefore, myocardium is NOT deeper than endocardium; it is more superficial.

  24. Thank u..! But there is two type of pericardium they are 1_fibrous pericardium (which contain strong fibrous ) and the second one is a 2_serous pericardium (the inner portion of pericardium which composed two layers A_visceral layer (which contact with myocardium ) B_parietal layer (which contact with fibrous pericardium ).

  25. I am a Spaniard going to school in Germany to become a nurse and you have no idea how much your videos are helping me. I get so lost in translation while in class sometimes…
    THANK YOU!

  26. there is no such balloon, the epicardium "Visceral pericardium" is a different structure from the pericardium "parietal pericardium", the epicardium forms from the splanchnic mesoderm of the sinus venosus (not from Spetum Trasversum) where the pericardium is formed, instead, from the pleural (peritoneal) membrane!

  27. Correct me if I am wrong, but isn't their a serous membrane known as the epicardium that surrounds the innermost layer of the pericardium, I am eleven years old and read this in a book and I am thinking this is correct

  28. Dude I love your videos. I have huge concentration issues so getting through biology and fysiology in school is a trouble for me. I don’t understand or remember any of the material they give me, but SOMEHOW i understand and remember it when I watch your videos. You are a great teacher! Thank you!

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