Board Certified in Holistic Nutrition (BCHN) Practice Exam 2025 - Free BCHN Practice Questions and Study Guide

Calcium plays a crucial role in muscle contraction and nerve transmission. When a nerve signal reaches a muscle, calcium is released from the sarcoplasmic reticulum into the muscle cells. This increase in calcium concentration binds to troponin, allowing the interaction of actin and myosin, which leads to muscle contraction. Additionally, calcium is essential for neurotransmitter release at synapses, facilitating communication between nerve cells.

While sodium is also important in muscle and nerve function, its primary role involves the generation and propagation of action potentials. Iron is vital for hemoglobin production and oxygen transport but does not directly participate in muscle contraction or nerve signal transmission. Magnesium is involved in numerous enzymatic reactions and can influence muscle function, but it functions more as a regulator rather than being the primary mineral responsible for contraction and transmission. Thus, Calcium is the key mineral that directly supports these essential processes in the body.