Bundles of muscle fibers that make up the muscle belly.
The whole muscle composed of many individual muscle fibers.
Connective tissue that surrounds the muscle belly.
Connective tissue that surrounds the fasciculi.
Connective tissue that surrounds the muscle fibers.
The thin protein filament found in muscle cells that together with myosin form sarcomeres, the contractile units of skeletal muscle.
The thick protein filament that together with actin form sarcomeres, the contractile units of skeletal muscle.
The contractile units of skeletal muscle. They are composed of two myofilaments, actin and myosin.
The extension of epimysium, perimysium and endomysium which attaches the muscle to the bones of the body.
Individual muscle fibers made up of hundreds of smaller elements.
Threadlike spirals that wrap around the actin filament which covers the myosin binding site which prevents myosin attachment during the relaxed state.
A calcium receptor that sits on top of troponin. In the presence of calcium it pulls tropomyosin away from the myosin binding site and allows myosin to bind to the actin filament and the sliding filament mechanism to commence.
Myosin Cross Bridge
The arm and head of myosin filament which extends to bind onto the actin filament.
A system of membranous sacs that surround the myofibrils. The sarcoplasm stores calcium and regulates its release during muscular contraction.