The muscles in your arm are primarily composed of what cell type?

The muscles in your arm are primarily composed of **skeletal muscle cells**, also known as **skeletal muscle fibers** or **myocytes**. These cells are: - **Multinucleated**: Each skeletal muscle fiber contains multiple nuclei, which helps manage the cell's large size and high protein synthesis demands. - **Striated**: Under a microscope, skeletal muscle cells display a striped or striated appearance due to the organized arrangement of actin and myosin filaments, which are essential for muscle contraction. - **Voluntary**: Unlike smooth or cardiac muscle cells, skeletal muscle cells are under voluntary control, meaning you can consciously control their movement. Skeletal muscle cells are responsible for generating the force needed for movements such as lifting, typing, or any other action involving your arms. They attach to bones via tendons, allowing for the coordination and execution of precise movements.