| A | B |
|---|
| muscle fiber | a muscle cell; may be single or multi nucleated |
| myofibrils | contractile part of muscle cell, made of myofilaments |
| muscle fatigue | the loss of a muscle's ability to contract |
| myofilaments | the contractile proteins of actin and myosin |
| sarcomere | organized unit of myofilaments that contract in response to a neural impulse |
| fascia | a band or sheet of dense connective tissue that covers, supports and separates muscles |
| fascicles | organized bundles of muscle fibers with blood vessels and nerves |
| epimysium | the outer layer of dense connective tissue surrounding individual skeletal muscles |
| aponeurosis | flat sheet of connective tissue that connects muscle to bone or muscle to muscle |
| skeletal muscle | striated, multi-nucleated muscle cells under voluntary control |
| cardiac muscle | striated, branched muscle cells found in heart tissue |
| sliding filament theory | the theory explaining the muscle contraction process |
| tendon | a band of connective tissue that connects muscle to bone |
| smooth muscle | spindle shaped muscle cells found in the walls of certain organs |
| neuromuscular junction | the connection point between a motor neuron and the muscle fiber it controls |
| acetylcholine | the neurotransmitter responsible for stimulating muscle contraction |
| threshold stimulus | the minimum amount of neural stimulation need to trigger a muscle contraction |
| sarcolemma | the special name for a muscle fiber cell membrane |
| actin | the thin contractile protein that creates the light bands in skeletal muscle |
| myosin | the thick contractile protein that creates the dark bands in skeletal muscl tissue |
