| A | B |
|---|
| skeletal muscle | appears striated |
| cardiac muscle | contains intercalcated disks |
| smooth muscle | found in walls of digestive tract/blood vessels |
| motion is voluntary in this muscle | skeletal muscle |
| motion is involuntary in this muscle | cardiac muscle, smooth muscle |
| tendons | connective tissue that attaches muscle to bone |
| tendon sheath | fluid-filled tube enclosing some tendons |
| bursae | fluid-filled sac between tendon and bone |
| muscle fiber | skeletal muscle cell |
| sarcomere | basic functional and contractile unit of muscle |
| actin | contractile protein making up thin filaments of sarcomere |
| myosin | contractile protein making up thick filaments of sarcomere |
| sliding filament model | describes/explains muscle contraction |
| requirements for muscle contraction | ATP molecules and calcium ions |
| movement, posture, heat production | functions of muscular system |
| prime mover | muscle mainly responsible for a given movement |
| synergist | muscle that helps prime mover |
| antagonist | muscle that opposes action of prime mover |
| motor unit | combination of motor neuron and all the muscle fibers it forms junctions with |
| motor neuron | specialized nerve cell that stimulates a muscle fiber |
| neuromuscular junction | point of contact between motor neuron and muscle fiber |
| connective tissue covering bundles of fascicles to make the skeletal muscle | epimysium |
| thin connective tissue covering each muscle fiber | endomysium |
| cell membrane of the muscle cell | sarcolemma |
| a long filamentous organelle found within muscle fibers that have a banded appearance | myofibril |
| thick or thin | myofilament |
| bundle of muscle fibers | fascicle |
| connective tissue covering fascicle | perimysium |
| cytoplasm of a muscle cell | sarcoplasm |
| area of a sarcomere where thick myofilaments are located | A band |
| area between sarcomeres where thin (and elastic) myofilaments are located | I band |
| Bisects the I band | Z line |
| Bisects the A band | M line |
