the ability to receive and respond to a stimulus, that is, any change in the environment inside or outside the body.
the ability of a muscle cell to recoil and resume its resting length after being stretched
an "overcoat" of dense irregular connective tissue that surrounds the whole muscle. It means "outside the muscle"
"within the muscle" whispy sheath of connective tissue that surrounds each individual muscle fiber.
epimysium of the muscle is fused to the periosteum of a bone or perichondrium of a cartilage
muscles connective tisue wrappings extend beyond the muscle either as a ropelike tendon of a sheetlike aponeurosis
much more common because of durability and small size
the plasma membrane of a muscle fiber, usually under the endomysium. below this is mutiple oval nuclei
rodlike contractile elements that occupy most of the muscle cell volume. they appear banded and have sarcomeres end to end. bundles of myofilament
the smallest contractile unit composed of myofilaments made of contractile proteins, region between the z disks made up of the a band and two half I bands at each end.
a repeating series of dark and light bands are evident along the length of each myofibril
is a protein in which has a kidney shape and is used to bear the active sites in which myosin heads attach during contraction, polypeptide subunits they are in thin filament
rod shaped protein that wraps around the thin filament to help stiffen and stabilize it (actin core)
globular three polpeptide complex one binds to tropomyosin another binds to actin and the last one binds calcium ions
helps the muscle to spring back into shape after being stretched extends from the z disk to the thick filament and forms the core of the thick filament
relaxed muscles that are slightly contracted to keep the muscles firm and healthy and ready to respond to stimulation. helps maintain posture and stabilize joints