The correct option is C Ca2+ ions are not important in maintaining the regular beating of the heart
Magnesium ions are associated with ATP to form a complex which together makes adenosine triphosphate stable.
Magnesium ions are centrally located in the chlorophyll structure. Thus, magnesium is important in the green parts of plants and plays an important role in photosynthesis.
Calcium ions plays an important role in the pathway of activation of protein factors responsible for blood clotting.
Calcium ions play an important role in muscle contraction which is why it is important for maintaining heartbeats.
Regular contraction of the heart is controlled by calcium ions.
Thus, option (a) is the false statement