Question

when comparing cardiac muscle cells and skeletal muscle cells. multiple choice the rate of action potential propagation is faster in cardiac muscle both possess intercalated discs. only skeletal muscle has a plateau phase in its contraction cycle. action potentials are conducted from cell to cell only in cardiac muscle. both are voluntary.

Explanation:

Cardiac muscle has a plateau phase in its contraction cycle which is not present in skeletal muscle. Action - potential propagation is faster in skeletal muscle. Only cardiac muscle has intercalated discs. Action potentials are conducted cell - to - cell in cardiac muscle via gap junctions in intercalated discs, not in skeletal muscle. Cardiac muscle is involuntary and skeletal muscle is voluntary.

Answer:

Only skeletal muscle has a plateau phase in its contraction cycle. (This option is incorrect as it's the opposite; cardiac muscle has a plateau phase).
The rate of action potential propagation is faster in cardiac muscle. (Incorrect, it's faster in skeletal muscle).
Both possess intercalated discs. (Incorrect, only cardiac muscle has intercalated discs).
Action potentials are conducted from cell to cell only in cardiac muscle. (Correct, due to gap junctions in intercalated discs).
Both are voluntary. (Incorrect, cardiac is involuntary and skeletal is voluntary). So the correct answer is: action potentials are conducted from cell to cell only in cardiac muscle.