In EK 9E Biology 2: Systems it states that
"The action potential of cardiac muscle exhibits a plateau after depolarization. The plateau is created by slow voltage-gated calcium channels, which allow calcium to enter and maintain the inside of the membrane at a positive potential difference. As a result, repolarization of cardiac muscle is slower and more frequent than that of skeletal muscle."
I'm not sure how they arrived at the conclusion that cardiac muscle repolarization is more frequent than repolarization of skeletal muscle and I'm not sure I understand what they mean.
Do they mean that the cardiac muscle spends more time in a depolarized state?
I would assume that if the repolarization frequency is higher, the depolarization frequency must also be higher, so are they saying cardiac muscle depolarization is more frequent than skeletal muscle? (which is understandable if the heart is pumping constantly)
Thanks!
"The action potential of cardiac muscle exhibits a plateau after depolarization. The plateau is created by slow voltage-gated calcium channels, which allow calcium to enter and maintain the inside of the membrane at a positive potential difference. As a result, repolarization of cardiac muscle is slower and more frequent than that of skeletal muscle."
I'm not sure how they arrived at the conclusion that cardiac muscle repolarization is more frequent than repolarization of skeletal muscle and I'm not sure I understand what they mean.
Do they mean that the cardiac muscle spends more time in a depolarized state?
I would assume that if the repolarization frequency is higher, the depolarization frequency must also be higher, so are they saying cardiac muscle depolarization is more frequent than skeletal muscle? (which is understandable if the heart is pumping constantly)
Thanks!