actually intial stimulation of a cardiac cell take the resting membrane potential of the cell to the positive value and when it hits threshold the voltage gated na+ channels opens depolarize the cell and then ca=+ and k+cahnnels opens simultaneously creating a plateu phase and then ca+ channels close but k+ channels remain opened and k+ leaves the cells bringing back to normal resting membrane potential makingthe the cell more electro negative!!! I was actually writing what i learned wtf
Everything you said it exactly right I was learning this last night since it’s relevant for drugs! What you have is for non pacemaker cardiac myocytes. I think in the video I mention T tubules because in skeletal muscle and cardiac muscle the T tubules are invaginations of the cell membrane and bring depolarization to the inner part of the muscle cell! Otherwise only the outer part of it would depolarize
actually intial stimulation of a cardiac cell take the resting membrane potential of the cell to the positive value and when it hits threshold the voltage gated na+ channels opens depolarize the cell and then ca=+ and k+cahnnels opens simultaneously creating a plateu phase and then ca+ channels close but k+ channels remain opened and k+ leaves the cells bringing back to normal resting membrane potential makingthe the cell more electro negative!!! I was actually writing what i learned wtf
Everything you said it exactly right I was learning this last night since it’s relevant for drugs! What you have is for non pacemaker cardiac myocytes. I think in the video I mention T tubules because in skeletal muscle and cardiac muscle the T tubules are invaginations of the cell membrane and bring depolarization to the inner part of the muscle cell! Otherwise only the outer part of it would depolarize
@@LearningMedSchool exactly !!!