Which three biological functions rely on calcium, a fundamental element found in limestone?
Answer
Bone structure, nerve function, and muscle contraction.
Calcium is highlighted as an element fundamental to human biological systems, and its role is specific and critical. The text explicitly states that calcium is vital for maintaining the structural integrity of the skeleton, meaning bone structure. Beyond structural support, calcium ions play an indispensable role in the nervous system by facilitating signal transmission across synapses, which is referred to as nerve function. Finally, calcium is a necessary trigger for the physiological process where muscle fibers shorten and generate force, known as muscle contraction. These three functions collectively represent the core biological requirements that calcium fulfills.
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