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chapter 4
Extracellular Junctions, Glands, and Membranes
| Term | Definition |
|---|---|
| Extracellular Junctions | Junctions between cells help cells function as a tissue. |
| Tight junction | plasma membrane proteins join, forming an impermeable barrier |
| Gap junction | plasma membrane channels join, allowing substances to pass between the two cells |
| Adhesion junction Desmosome | adjacent plasma membranes held together by extracellular filaments |
| Glands | consist of one or more cells that produce and secrete a product; most are composed primarily of epithelium. |
| Exocrine glands | secrete their product onto the outer surface or into a cavity |
| Exocrine glands | goblet cells and sweat glands |
| Endocrine glands | ductless and secrete their product internally to be transported by the bloodstream |
| Endocrine glands | pituitary and thyroid glands |
| Mucous membranes | Line interior walls of the organs and tubes that open to the outside of the body Ex: digestive, respiratory, urinary, and reproductive systems |
| Mucous membranes | Consist of epithelium overlying a layer of loose connective tissue Epithelium contains goblet cells that secrete mucus |
| Serous membranes | Consist of a layer of simple squamous epithelium overlying a layer of loose connective tissue |
| Serous membranes Parietal | membranes line the thoracic and abdominopelvic cavities |
| Serous membranes Visceral | membranes cover internal organs |
| serous fluid | Serous membranes fluid - lubricates |
| Serous membranes Pleurae | serous membranes in the thorax |
| Serous membranes Pericardium | covers the heart |
| Serous membranes Peritoneum | within the abdomen |
| Parietal pleura | lines thoracic wall |
| Visceral pleura | covers the surface of the lungs |
| Visceral Peritoneum | covers the organs in the abdominopelvic cavity |
| Parietal Peritoneum | lines the abdominopelvic wall |
| Synovial membranes | Line freely movable joint cavities Composed of connective tissue |
| Synovial Fluid | Synovial Membrane Fluid Lubricates the ends of bones |
| Meninges | Found within the posterior cavity Composed entirely of connective tissue Protective covering for the brain and spinal cord |
| Cutaneous membrane Skin Membrane | Forms the outer covering of the body Consists of an outer portion of keratinized stratified squamous epithelium attached to a thick layer of dense connective tissue |
Created by:
JamieS1982