| A | B |
|---|
| rigor mortis | after death, muscles in the body stiffen from a lack of blood and oxygen |
| what happens without oxygen | anaerobic respiration begins and produces lactic acid which makes muscles contract |
| rigor mortis usefulness | determines the time of death |
| striated muscle (striped) | attach to bone, allows movement, generate heat |
| striated muscle (striped) | fatigue quickly, multi-nucleated cells (largest cells in body) |
| smooth muscles | spindle shaped fibers, not attach to bones, not strong, |
| smooth muscles | high endurance, surrounds organs and blood vessels, single nucleus, in control of involuntary function |
| cardiac muscles | involuntary function, striated (striped), |
| cardiac muscles | found only in the heart, strong and rhythmic contractions |
| cardiac muscles | high endurance, single nucleus |
| 3 kinds of muscles | striated, smooth, cardiac |
| striated | means striped |
| myofibril | units of muscle fiber that help in contractions |
| sarcomere | small units of the myofibril where contraction takes place |
| myosin | a protein in muscles that helps them contract |
| myosin | make the thick filament in the sarcomere |
| actin | a protein in muscles that helps them contract |
| actin | make the thin filament in the sarcomere |
| myosin head | part of the myosin where the actin attaches itself |
| I Band | where they overlap and it includes the H-Zone too |
| H Zone | band that just has myosin |
| Z Disc | one sarcomere ends and the next begins |
| ATP | energy molecule called Adenosine Triphosphate |
| cross bridge | the cross bridges are identical sites of interaction between thick and thin filaments |
| tendon | fibrous connective tissue that attaches a muscle to a bone |
| antagonistic | muscles are designed to work against each other to produce the range of motion allowed by the skeleton |
| flexors | bend the joints |
| extensors | straighten the joint |
