UPSC Prelims 2013·GS1·geography·indian geography

Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by human body for the contraction of muscles?

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  1. A1 only
  2. B2 and 3 only
  3. C1 and 3 only
  4. D1, 2 and 3Correct

Explanation

Calcium is essential for muscle contraction as it binds to troponin, initiating the sliding filament mechanism. Sodium is crucial for nerve impulse transmission and the depolarization of muscle cells, which triggers contraction. Iron is required for the production of myoglobin, which stores oxygen in muscle cells, and for enzymes involved in energy production (ATP) necessary for muscle function and sustained contraction. Therefore, all three minerals are required for muscle contraction.
geography: Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by human

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