Cardiac excitation-contraction coupling

What is cardiac excitation-contraction coupling? Cardiac excitation-contraction coupling is the relationship between electrical signals in the form of action potentials, and mechanical changes in the heart muscle cells, called cardiomyocytes, that causes them to contract.

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[calmness]

This is amazing, am at the 1st year in college and am studying anesthesia which is bit hard but you guys saving me here 🙏🙏🙏

[FishareFriendsNotFood]

Love watching these videos and pretending I'm a doctor

[u]

i'd say this is a bit confusing, as you give no explanation of the action potnetial that occurs just before the contraction. Your video suggests the action potential of one cardiomyocyte is triggered by calcium entering, but its my understanding that its initially sodium ion channels that open cuasing a rush of sodium into the cell- this is what triggers the AP of the myocardium cell (NOT calcium)- calcium enters later, after the Na channels close- and its the Ca2+ entering via the t tubules intracellularly, binding to the Arginine receptor of the SR, that opens the calcium gate on the SR, massive Ca released, that causes the Ca spark, triggering the contraction- missing the Na is a vital first step that would get any medical students a failed mark if asked what happens first on the AP and contraction of a cardiac muscle cell..

[TheMedCoach]

You are charging for same videos on Premium, and free here, why ?