| Consider the following minerals. |
| 1. Calcium |
| 2. Iron |
| 3. Sodium |
| Which of the mineral(s) given above is/are required by human body for the contraction of muscles? |
A) Only 1
B) 2 and 3
C) 1 and 3
D) All of these
Correct Answer: D
Solution :
Exp. [d] Calcium is necessary for activating enzymes, which cause muscle contraction. Iron helps in the energy production, which is needed for the muscles to contract properly. Iron also helps muscles to store oxygen, which fuels muscle contractions. Sodium is also needed for muscle contraction because it balances potassium to maintain membrane potential.
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