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Biology
WCHS Biology Chapter 34
| Word | Definition |
|---|---|
| Epidermis | in plants, the outermost layer of flattened cells that covers and protects all parts of the plant; in humans and some other animals, the outermost protective layer composed of an outer layer or dead cells and an inner layer of living cells |
| Keratin | protection found in the exterior portion of the epidermis that helps protect living cells in the interior epidermis |
| Melanin | pigment found in cells of the interior layer of the epidermis; protects cells form solar-radiation damage |
| Dermis | inner, thicker portion of the skin that contains structures such as blood vessels, nerves, nerve endings, hair follicles, sweat glands, and oil glands |
| Hair Follicle | narrow cavities in the dermis from which hair grows |
| Axial Skeleton | one of two main parts of the human skeleton, includes the skull and the bones that support it, such as the vertebral column, ribs, and sternum |
| Appendicular Skeleton | one of two main parts of the human skeleton, includes the bones of the arms and legs and associated structures, such as the shoulders and hip bones |
| Joint | point where two or more bones meet; can be fixed or facilitate movement of bones in relation to one another |
| Ligament | tough band of connective tissue that attaches one bone to another; joints are often held together and enclosed by ligaments |
| Bursa | fluid-filled sac located between the bones that asborb shock and keep bones from rubbing against each other |
| Tendon | thick bands of connective tissue that attach muscles to bones |
| Compact Bone | layer of protective hard bone tissue surrounding every bone; composed of repeating units of osteon systems |
| Osteocyte | newly formed bone cells |
| Spongy Bone | soft bone containing many holes and spaces surrounded by a layer of more dense compact bone |
| Osteoblast | (blank) |
| Red Marrow | (blank) |
| Yellow Marrow | (blank) |
| Smooth Muscle | (blank) |
| Involuntary Muscle | (blank) |
| Cardiac Muscle | (blank) |
| Skeletal Muscle | (blank) |
| Voluntary Muscle | (blank) |
| Myofibril | (blank) |
| Myosin | (blank) |
| Actin | (blank) |
| Sarcomere | (blank) |
| Sliding Filament Theory | (blank) |
Created by:
dmoudy
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