Final answer:
Sodium plays important roles in muscle functioning, transporting substances into cells, and nerve transmission.
Step-by-step explanation:
Sodium plays several important roles within the body. Firstly, it is essential for proper muscle functioning, as it helps in the contraction and relaxation of muscles. Secondly, sodium is involved in transporting small substances into cells, such as glucose and amino acids. Finally, sodium is crucial for nerve transmission, as it helps in generating and transmitting electrical signals between nerve cells.
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