Question

which of the following is the role of calcium in the body.
a it is a component of most organic molecules, in ionic form, it influences the ph of body fluids.
b it is a component of proteins and nucleic acids.
c it is found as a salt in bones and teeth; in ionic form, it is required for muscle contraction, neural transmission, and blood clot
d it is a major component of both organic and inorganic molecules as a gas, it is essential to the oxidation of glucose and other
during which cellular energy is produced
e it is the primary elemental component of all organic molecules.

Explanation:

Calcium is stored as a salt in bones and teeth. In its ionic form ($Ca^{2+}$), it plays crucial roles in muscle contraction (by binding to troponin - causing a conformational change that allows muscle filaments to slide), neural transmission (facilitating the release of neurotransmitters at synapses), and blood clotting (involved in the activation of clotting factors). Organic molecules typically do not have calcium as a major component, and it is not a component of proteins and nucleic acids in the way described in option b. Also, the elements essential for the oxidation of glucose for energy production are mainly carbon, hydrogen, oxygen, and elements like phosphorus and nitrogen in key energy - related molecules.

Answer:

C. It is found as a salt in bones and teeth; in ionic form, it is required for muscle contraction, neural transmission, and blood clotting.