Which of the Following Statements About Cardiac Muscle Is Incorrect

Multiple Choice

Which of the following statements about cardiac muscle is incorrect?

A) Cardiac muscle forms an electrically coupled mass called a syncytium.
B) Much of the calcium necessary for contraction comes from outside the cell.
C) In cardiac muscles, the T-tubules form diads rather than the triads formed in skeletal muscles.
D) All of the above statements are correct.