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A&P Class Week 2
Contains Cell Diversity, Cell Anatomy, and Tissues of the Body
| Term | Definition |
|---|---|
| Nucleus | The headquarters, or control center of a cell. Contains the genes. |
| Nuclear Envelope | The nucleus is bound by a double membrane barrier called the nuclear envelope or nuclear membrane. |
| Nucleolus | Very center of the nucleus |
| Chromatin | The structures in the nucleus that carry the hereditary factors (genes). |
| Plasma Membrane | Membrane that encloses cell contents; outer limiting membrane. |
| Cytosol | Semi-transparent fluid that suspends the other elements. |
| Mitochondria | The rod-like cytoplasmic organelles responsible for ATP generation. |
| Ribosomes | Cytoplasmic organelles at which proteins are synthesized. |
| Endoplasmic Reticulum | A membranous network of tubular or sack-like channels in the cytoplasm of a cell. |
| Golgi Apparatus | A stack of flattened membranous sacs, associated with swarms of tiny vesicles. |
| Lysosomes | Organelles that originate from the Golgi apparatus and contain strong digestive enzymes. |
| Centrioles | A minute body found near the nucleus of the cell composed of microtubules; active in cell divisions. |
| Epithelial Tissues | Is the lining, covering, or glandular tissue of the body. |
| Simple Squamous Epithelium | Single layer of thin squamous cells resting on a basement membrane. Found in Air sacs of the lungs. |
| Simple Cuboidal Epithelium | One layer of cuboidal cells cresting on a basement membrane. Found in salivary glands and pancreas. |
| Simple Columnar Epithelium | Made up of a single layer of tall cells that fit closely together. Found in the entire length of the digestive tract. |
| Stratified Squamous Epithelium | Most common stratified epithelial in the body. Consists of several layers of cells. Found in the esophagus, the mouth, and the outer portion of the skin. |
| Stratified Cuboidal Epithelium | Typically has just two layers of cells. |
| Stratified Columnar Epithelium | Columnar cells, but its basal cells vary in size and shape. |
| Glands | Consists of one or more cells that make and secrete a particular product. |
| Connective Tissues | Tissues that connect body parts, primarily involved in protecting, supporting, and binding together. |
| Bone | Sometimes called osseous tissue, it is composed of bone cells sitting in cavities and surrounded by layers of very hard matrix which contain calcium salts. |
| Cartilage | Less hard and more flexible than bone; Attaches ribs to breastbone; Covers ends of bones; Between vertebrae; Supports external ear |
| Dense Connective Tissue | Forms strong rope-like structures such as tendons and ligaments |
| Tendons | Connects skeletal muscle to bone |
| Ligaments | Connects bones to bones at joints. |
| Loose Connective Tissue | Softer and have more cells and fewer fibers than any other connective tissue. |
| Areolar Tissue | Most widely distributed connective tissue. Soft, pliable, spider-webby tissue that cushions and protects the body organs it wraps. |
| Adipose Tissue | Commonly called fat. Areolar type tissue where fat cells dominate. |
| Blood | Also known as vascular tissue. Considered connective tissue because it has blood cells, but is very different from all other connective tissues. |
| Muscle Tissues | Are highly specialized to contract and shorten, to produce movement. |
| Skeletal Muscle Tissue | Packaged together by connective tissue sheets tinto organs called skeletal muscles. Can be controlled voluntarily. |
| Cardiac Muscle Tissue | Found only in the heart. Under involuntary control. |
| Smooth Muscle Tissue | Visceral muscle is so called because no striations are visible. Found in the walls of hollow organs, such as bladder, stomach, uterus. |
| Nervous Tissue | Receive and conduct electrical impulses. Irritability and conductivity are the two main functional characteristics. |