Which mineral is important for muscle contraction and found in bananas and oranges?

Potassium is a crucial mineral for muscle contraction, as it helps maintain the proper balance of fluids and electrolytes in the body. During muscle contraction, potassium plays a vital role in transmitting electrical impulses that lead to the contraction and relaxation of muscle fibers. A deficiency in potassium can result in muscle weakness, cramps, and abnormal heart rhythms, highlighting its essential function in muscle health.

Fruits like bananas and oranges are well-known for their high potassium content, making them excellent dietary sources for individuals looking to support their muscle function and overall health. Given its role and prevalence in these fruits, potassium is indeed the correct choice in the context of this question.