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muscles
| Term | Definition |
|---|---|
| Skeletal Muscle | Muscle attached to bones, helps move the body |
| cardiac muscle | Muscle in the heart, pumps blood |
| smooth muscle | Muscle in organs like the stomach and blood vessels, works automatically |
| tendon | A strong band that connects muscles to bones |
| sarcomere | The smallest part of a muscle that helps it contract |
| Sarcoplasmic Reticulum | A structure in muscle cells that stores and releases calcium |
| Calcium Ions (Ca+2) | Tiny particles that help muscles contract |
| Actin Filaments | Thin fibers in muscles that work with myosin to help muscles move |
| Myosin Filaments | Thick fibers in muscles that pull on actin to cause contraction |
| Troponin | A protein that helps control muscle contraction by responding to calcium |
| Tropomyosin | A protein that blocks or allows muscle contraction by covering actin |
| Adenosine Triphosphate (ATP) | The energy molecule muscles use to work and contract |
| Muscle Fatigue | decline in the muscle's ability to generate force over time |
| Electromyogram (EMG) | diagnostic test that records the electrical activity produced by skeletal muscles |
| Tetany | condition characterized by involuntary, sustained muscle contractions or spasms |
| attachment that moves | insertion |
| Muscles must cross at least _ joint | 1 |
| attachment that remains stationary | origin |
| Muscles must have at least _ points of attachment | 2 |
| Muscles work in _ pairs | opposing |
| decreases the angle | flexor |
| increases the angle | extensor |
| Muscles can only _ | pull |
| striations show the _ of muscle contraction | direction |
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