Anatomy & Physiology: Muscular System Flashcards
Muscular System
Responsible for all types of body movement and provides support, stabilizing joints, and generating heat for the body.
Muscle Fibers
Specialized cells that make up all muscles.
Cardiac Muscle
Consists of muscle cells that are striated, short, branched, and found in the walls of the heart.
Skeletal Muscle
Cells are striated, long, and cylindrical. Attached to bones in the body.
Smooth Muscle
Non-striated muscle cells that are spindle-shaped and found in the walls of internal organs like the bladder and stomach.
Endomysium
Encases individual skeletal muscle fibers.
Perimysium
Muscle fibers that are bundled together by a connective tissue.
Fasciculi
Bundles of skeletal muscle fibers.
Epimysium
Fascicles are bundled together by a strong connective tissue.
Sarcolemma
The cell membrane that surrounds a skeletal muscle fiber.
Sarcoplasm
The cytoplasm of the skeletal muscle fiber.
Myofibrils
One muscle fiber is filled with several long, cylindrical proteins.
Sarcomere
The smallest contractile unit in a myofibril.
Myofilaments
A myofibril is the result of several of these. There are two types.
Myosin
Thick bands, or myofilaments, are made of several protein molecules.