Skeletilihase

Skeletilihase, also known as voluntary muscle or striated muscle, is one of the three major types of muscle tissue in the human body. It is found attached to bones, enabling voluntary movement of the skeleton. The characteristic striped appearance of skeletal muscle, visible under a microscope, gives it its name "striated."

Skeletal muscle fibers are long, cylindrical, and multinucleated, meaning each cell contains multiple nuclei. These fibers are composed of myofibrils, which in turn are made up of repeating units called sarcomeres. The arrangement of actin and myosin filaments within the sarcomeres is responsible for the muscle's ability to contract. Contraction is initiated by a signal from the nervous system, which causes the actin and myosin filaments to slide past each other, shortening the muscle.

The primary function of skeletal muscle is to produce movement. It allows us to walk, run, lift objects, and perform countless other physical actions. Beyond locomotion, skeletal muscles also play a role in maintaining posture, stabilizing joints, and generating heat to help regulate body temperature. The strength and endurance of skeletal muscles can be improved through regular exercise and training. Damage to skeletal muscle can occur due to injury, overuse, or certain diseases, leading to pain, weakness, and impaired function.