A compartment in a myofilament is called a "sarcomere." Sarcomeres are the basic contractile units of muscle fibers, consisting of overlapping thick (myosin) and thin (actin) filaments. They are arranged end to end along the length of the myofibril, and their contraction leads to muscle shortening and force generation during movement.
The thin myofilament of skeletal muscles is made of the globular protein called actin.
The protein that makes up the thick myofilament in muscle cells is called myosin. Myosin is a motor protein that plays a key role in muscle contraction by interacting with actin, the protein in the thin myofilament.
protein that makes up thin myofilament
The myosin myofilament pulls on the actin myofilament during muscle contraction. This interaction, known as the sliding filament theory, results in the shortening of the sarcomere and muscle contraction.
myofilament myofibril myofiber fascicle muscle
Actin (thin myofilament), myosin (thick myofilament), calcium, and ATP (energy).
myofilament
Myosin
muscle
Myosin
Fascicle (largest) Fiber Myobibril Myofilament (smallest)
I is called a "Stall"