Which is true of muscle contraction?

Options

A. Sarcolemma becomes permeable to `Ca^(2+)` ion
B. Sarcolemma becomes permeable to `Na^(+)` ions
C. Sarcolemma becomes nonpermeable to `Na^(+)` ions
D. Concentration of `Ca^(2+)` ions is reduced in myoplasm.

Answer

B