Question

Why can cardiac muscle fibers contract for longer periods than skeletal muscle fibers?
1) Cisternae of T-tubules is more developed in cardiac muscle
2)Extracellular calcium partially controls the strength (and length) of contraction

3)Cardiac muscle is uninucleate rather than multinucleate
4) Cardiac muscle is self-excitatory,​

Answer 1

Answer:

4 is right I think

Explanation:

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