How does the structure of cardiac muscle it perform its function?
a. its spindle-shaped cells allow it to do smooth movements.
b. its striations allow for big movements.
c. its discs allow it to coordinate movement with other cells.
d. its multinucleated cells allow it to trigger involuntary actions

The correct answer is (a.) Its spindle-shaped cells allow it to do smooth muscles. The structure of the cardiac muscles which is spindle-shaped is very important for the heart to withstand the stretching of the muscles during the contractions. Also for its smooth surface which is very important to prevent any possible blood clot during circulation.