Skeletal muscle cells, also known as muscle fibers, are long, cylindrical cells that make up the skeletal muscles in the body. These cells are multinucleated, meaning they contain multiple nuclei, which helps them manage the large amounts of protein needed for contraction. Skeletal muscle cells are striated, giving them a striped appearance under a microscope, and they are responsible for voluntary movements, such as walking and lifting. These cells contract in response to signals from the nervous system, allowing for precise control of movement. They are highly adaptable and can increase in size and strength with regular exercise. Additionally, skeletal muscle cells play a role in maintaining posture and generating heat during physical activity.