| A | B |
|---|
| Periosteum | Tough layer of connective tissue surrounding a bone |
| Haversian Canal | One of a network of tubes running through compact bone that contains blood vessels and nerves |
| Bone Marrow | Soft tissue inside cavities within bones; two types are yellow and red |
| Cartilage | Strong connective tisssue that supports the body and is softer and more flexible then bone |
| Ossification | Process of bone formation, during which cartilage is replaced by bone |
| Joint | Place where one bone attaches to another |
| Ligament | Strip of tough connective tissue in a joint that holds bones together |
| Myosin | Protein that makes up the thick filaments in striations in skeletal muscle cells |
| Actin | A protein that mainly makes up the thin filaments in striations in skeletal muscle cells |
| Neuromuscular Junction | Point of contact between a motor neuron and a skeletal muscle cell |
| Acetylcholine | Neurotransmitter that diffuses across a synapse and produces an impulse in the cell membrane of a muscle cell |
| Tendon | Tough connective tissue that joins skeletal muscles to bones |
| Epidermis | Outer layer of the skin |
| Keratin | Tough, fibrous protein found in skin |
| Melanin | Dark-brown pigment found in the skin |
| Dermis | Inner most layer of the skin |
| Hair Follicle | Tubelike pocket of epidermal cells that extends into the dermis to produce hair |
