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cfarina-Skul/Musc
| Term | Definition |
|---|---|
| vertebra | segment of the backbone; encloses and protects the nerve cord |
| cartilage | type of connective tissue softer than bone |
| marrow | specialized tissue found in bone; yellow bone marrow consists of stored fat that serves as an energy reserve; red bone marrow makes cells that develop into blood cells |
| joint | area where one bone meets another |
| ligament | strong fibrous connective tissue that holds together the bones in movable joints |
| arthritis | group of skeletal disorders characterized by inflamed joints |
| osteoporosis | disorder in which bones become thinner, more porous, and more easily broken |
| tendon | dense connective tissue that attaches a muscle to a bone |
| muscle fiber | single, long cylindrical muscle cell containing many nuclei |
| myofibril | unit of muscle fiber made up of smaller units that contract |
| sacromere | unit of contraction in a muscle fiber |
| actin | twisted, thin filament in a muscle fiber |
| myosin | thick filament in a muscle fiber; has bump-like projections |