Muscles are responsible for generating movement, producing heat, and storing energy.

Muscle fibers are composed primarily of actin and myosin filaments, which slide past each other during muscle contraction.

Skeletal muscle is attached to bones and is responsible for voluntary movement.

Tendons connect muscles to bones, provide flexibility, and transmit force generated by muscles to bones.

Smooth muscle is found in the walls of internal organs and is responsible for involuntary movements such as digestion and blood vessel constriction.

Ligaments connect bones to bones, provide stability, and prevent excessive movement at joints.

Cardiac muscle is found only in the heart and is responsible for the rhythmic contractions that pump blood throughout the body.

The gluteus maximus is the largest muscle in the human body, located in the buttocks.

Strains, sprains, and contusions are all common types of muscle injuries.

The sliding filament theory, cross-bridge theory, and motor unit recruitment are all involved in the process of muscle contraction.

Type IIb muscle fibers are specialized for fast, powerful contractions.

The sarcoplasmic reticulum stores, releases, and regulates calcium ions, which are necessary for muscle contraction.

Type I muscle fibers are specialized for endurance activities.

The sliding filament theory, cross-bridge theory, and motor unit recruitment are all involved in the process of muscle contraction, not relaxation.

Muscular dystrophy, myasthenia gravis, and fibromyalgia are all common types of muscle disorders.