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Myocardial cells have long refractory periods in order to ensure each contraction is____. This is
due to the presence of_______
channels in these cells that allow the_____of_____ ions right after
ions have entered.

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Answer:These contractile elements are virtually identical to skeletal muscle. ... (a) Cardiac muscle cells have myofibrils composed of myofilaments arranged in sarcomeres, ... The refractory period is very long to prevent the possibility of tetany, a ... At this point, the calcium ion channels close and K+ channels open, allowing outflux ..

Explanation:

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