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Chapter 23
Integumentary, Muscular, Skeletal Systems
| Term | Definition |
|---|---|
| integument | an enveloping layer of an organism |
| epidermis | in humans and some other animals, the outer superficial layer of skin made up of epithelial cells |
| keratin | protein contained in the skin's outer epidermal cells that waterproofs and protects underlying cells and tissues |
| melanin | pigment in the inner layer of the epidermis that protects against harmful ultraviolet radiation and influences skin color |
| hair follicle | narrow cavity in the dermis from which a hair grows |
| sebaceous gland | oil-producing gland in the dermis that lubricates skin and hair |
| cartilage | tough, flexible connective tissue that forms the skeletons of embryos and later covers the surface of bones that move against each other in joints |
| axial skeleton | |
| appendicular skeleton | |
| compact bone | |
| osteocyte | |
| spongy bone | |
| red bone marrow | |
| yellow bone marrow | |
| osteoblast | |
| ossification | |
| osteoclast | |
| ligament | |
| smooth muscle | |
| involuntary muscle | |
| cardiac muscle | |
| skeletal muscle | |
| voluntary muscle | |
| tendon | |
| myofibril | |
| myosin | |
| actin | |
| sarcomere | |
| anaerobic | chemical reactions that do not require the presence of oxygen |