What is a skeletal muscle and it voluntary or involuntary?

Skeletal muscle is a type of muscle tissue that is attached to the bones of the skeleton. It is responsible for the movement of the body's limbs and joints. Skeletal muscle is voluntary muscle, which means that it can be controlled consciously.

Skeletal muscle cells are long, cylindrical cells that are multinucleated. They contain numerous myofilaments, which are protein filaments that are responsible for muscle contraction. When a nerve impulse reaches a skeletal muscle cell, it causes the release of calcium ions from the sarcoplasmic reticulum (SR). These calcium ions bind to the myofilaments, causing them to slide past each other and produce muscle contraction.

Skeletal muscle is striated, which means that it has a repeating pattern of light and dark bands. This striation is due to the regular arrangement of the myofilaments within the muscle cells.

Skeletal muscle is important for a variety of body functions, including:

* Movement: Skeletal muscle is responsible for the movement of the body's limbs and joints.

* Posture: Skeletal muscle helps to maintain the body's posture.

* Heat production: Skeletal muscle produces heat when it contracts, which helps to keep the body warm.

* Protection: Skeletal muscle helps to protect the body's organs from injury.

Skeletal muscle is a complex tissue that is essential for human movement. It is a voluntary muscle, which means that it can be controlled consciously.