| A | B |
|---|
| connective tissue covering a bundle of muscle cells | epimysium |
| contractile unit of muscle | sarcomere |
| a muscle cell | myofiber |
| thin connective tissue covering each muscle cell | endomysium |
| cell membrane of the muscle cell | sarcolemma |
| a long filament found within muscle cells that have a banded appearance | myofibril |
| actin or myosin | myofilament |
| cordlike extension of connective tissue beyond the muscle and serving to attach it to bone | tendon |
| bundle of muscle cells | fasciculus |
| connective tissue covering fasciculi | perimysium |
| cytoplasm of a muscle cell | sarcoplasm |
| area of a sarcomere where myosin is located | A band |
| area between sarcomeres where only actin is located | I band |
| thick filament | myosin |
| thin filament | actin |
| in the center of an I band where actin forms a zigzag | Z line |
| extra credit | e-mail your teacher and say "I love winter!" |
