| A | B |
|---|
| joint | Point where two bones meet |
| tendon | Attaches muscles to bones |
| ligament | Connects bones to bones |
| cartilage | Reduces friction & absorbs compression |
| synovial fluid | Lubricates to reduce friction & provides nutrients to the cells of the cartilage |
| joint capsule | surrounds the joint, encloses the synovial cavity |
| biceps muscle | contracts to bring about flexion of the arm |
| triceps muscle | contracts to bring about extension of the arm |
| humerus | Acts as a lever that allows anchorage of the muscles of the elbow |
| radius | Acts as a lever for the biceps muscle |
| ulna | Acts as a level for the triceps muscle |
| flexion | Decrease in angle between 2 connecting bones |
| extension | Increase in angle between 2 connecting bones |
| abduction | Movement of bones away from the midline of the body |
| adduction | Movement of bones towards the midline of the body |
| circumduction | distal or far end of a limb moves in a circle |
| rotation | A bone revolves around its own longitudinal axis |
| sarcolemma | Plasma membrane of the muscle cell |
| sarcoplasmic reticulum | Fluid-filled system of membranous sacs surrounding muscle myofibrils |
| glycosomes | Store glycogen |
| glycogen | Carbohydrates are broken down into this material and stored in muscles |
| myoglobin | Red-colored protein found in the sarcoplasm |
| T tubules | Deep invagination of the sarcolemma that allow depolarization of the membrane to release Ca ions. |
| myofibril | Rod-shaped bodies that run the length of the cell and contain contractile filaments |
| actin | Contractile protien found in thin filaments |
| myosin | Contractile protein found in thick filaments |
| A band | Dark and extend the entire length of the myosin filaments |
| I band | Light band that contains only actin |
| Z line | Site where actin filaments are anchored; marks the ends of the sarcomere |
| H zone | Area of A band that contains only myosin |
| neuromuscular junction | Point at which a neuron and muscle cell meet |
| troponin | A protein of muscle tissue that binds calcium ions and is involved in contraction |
| tropomyosin | a muscle protein of the I band that inhibits contraction by blocking the interaction of actin and myosin |
| rigor mortis | Rigidity of death |
| acetylcholine | Neurotransmitter that stimulates a muscle cell to contract |
