Very Educative : Why Doesn’t the Heart Rip?


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10 comments

  • tq so much for your help and support for the explanation……………. 

  • god bless the augmenting video speed option!great lesson to review really

  • Would it be a correct analogy to think of Desmosomes as rivets on a plane or a building? 

  • So, Leplace's Law is the tension and how stretched out the walls are and Starling Law is more stretch causes higher contraction between the Myosin and Actin, is that right?

  • starling law is about the size of a contraction. when the myocard is stretched, sarcomeres have more space between each other so they can contract more and vice versa. the more stretched the heart, the bigger the following contraction. LAplace's law is about tension on the walls. If the heart is (pathologically) dilated, LV has bigger radius thus greater the tension on the walls when contracting. on the other hand, hypertrophied heart has thicker wall, so the load on the wall is lower 

  • so i think both laplace law and starling law are opposite to each other or what !!!
    please i need an explanation

  • i have a question …
    according to laplace law ..the more end-diastolic volume will increase the radius which oppose or decrease the myocardial contractility force forexample that at congestive heart failure we give venodilator and diuretics to decrease venous return therefore decrease enddiastolic volume and radius so heart can pump well…but but but according to frank starling more the more preload = venous return = end diastolic volume ..the more myocadial tension and forcefull contraction.

  • thank you so much the last freaking sentence solved my problem…the thicker the wall the more desmosomes…and same for all other thick walled spherical objects. wow!