| A | B |
|---|
| SMOOTH MUSCLES | MUSCLE COMPOSED OF SHEETS OF SPINDLE-SHAPED CELLS; LINES INTERNAL ORGANS AND BLOOD VESSELS; PRODUCES INVOLUNTARY CONTROLLED CONTRACTIONS |
| INVOLUNTARY MUSCLE | MUSCLE WHOSE CONTRACTIONS ARE NOT UNDER CONCIOUS CONTROL |
| CARDIAC MUSCLE | INVOLUNTARY MUSCLE FOUND ONLY IN THE HEART; CONTAINS INTERCONNECTED CELLS THAT APPEAR STRIATED AS A RESULT OF PROTEINS IN THE CELLS; CONDUCTS ELECTRICAL IMPULSES THAT PRODUCE RHYTHMIC CONTRACTIONS |
| SKELETAL MUSCLE | MUSCLE ATTACHED TO BONES; FUNCTIONS UNDER VOLUNTARY CONTROL TO MOVE THE SKELETON; COMPOSED OF STRIATED, MULTINUCLEATED MUSCLE |
| VOLUNTARY MUSCLE | MUSCLE WHOSE CONTRACTIONS ARE UNDER CONCIOUS CONTROL |
| MYOFIBRIL | SMALL CONTRACTILE MUSCLE PART COMPOSED OF THICK MYOSIN PROTEIN FILAMENTS AND THIN ACTIN PROTEIN FILAMENTS |
| MYOSIN | A STRUCTURAL PROTEIN IN MUSCLE CELLS; TOGETHER WITH THE PROTEIN ACTIN, FUNCTIONS IN MUSCLE CONTRACTIONS |
| ACTIN | STRUCTURAL PROTEIN IN MUSCLE CELLS; TOGETHER WITH THE PROTEIN MYOSIN, FUNCTIONS IN MUSCLE CONTRACTION |
| SARCOMERE | EACH SECTION OF A MYOFIBRIL IN A STRIATED MUSCLE |
| SLIDING FILAMENT THEORY | ACTIN FILAMENTS SLIDE TOWARD EACH OTHER DURING MUSCLE CONTRACTION, WHEREAS THE MYOSIN FILAMENTS REMAIN STILL. |
