The following is true of cardiac muscle cells:
Intercalated discs contain desmosomes which are directly responsible for electrochemical and metabolic coupling
Intercalated discs contain gap junctions which are directly responsible for the spread of action potentials between cells
Intercalated discs are dense regions where calcium accumulates after it is released from the sarcoplasmic reticulum
The arrival of an action potential leads to the relaxation of the muscle cell
The arrival of an action potential allows for the sequestration of calcium in the sarcoplasmic reticulum
Correct answer
Intercalated discs contain gap junctions which are directly responsible for the spread of action potentials between cells
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correct answer: B
Gap junctions are key components of the intercalated discs in cardiac muscle cells. They allow for direct ion flow between the cells, leading to the spread of APs and synchronous muscle contraction