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HB: Chapter 4
Term | Definition |
---|---|
Epithelial tissue | Sheets of cells that line or cover various surfaces and body cavities |
Glands | Epithelial tissue that specialize in synthesizing and secreting products (hormones, enzymes, oil) |
Exocrine Gland | Excretes through a hollow organ or tube |
Endocrine Gland | Excretes directly into the bloodstream |
Basement Membrane | Noncellular layer made of connective tissue. Serves as anchorage for epithelial tissue. |
Connective Tissue | Supports softer organs |
Tight Junctions | Form leak proof seals between cells. Important to epithelial cells that line digestive system. |
Adhesion Junctions | Protein filaments that form lose / stretchy junction between cells. Important to the elasticity of skin. |
Gap Junction | Channels that allow material to move between cells next to each other such as ions and water. |
Fibroblasts | Cells that produce the proteins that compose the collagen, elastic, and reticular fibers of connective tissue. |
Muscle Tissue | Specialized cells that shorten resulting in a movement of some kind. |
Skeletal Muscle | Voluntary. Connects with tendons to bone. Provides locomotion. Cells are multinucleated. |
Cardiac Muscle | Involuntary. Short parallel cells. Single nucleus. Gap junctions that pass a coordinated contraction. |
Smooth Muscle | Involuntary. Surround hollow organs and tubes including blood vessels, digestive tract, uterus and bladder. |
Nervous Tissue | Specialize in generating and transmitting electrical impulses throughout the body. |
Glial Cells | Nutritive support cells of nervous tissue. Doesn't transmit electrical impulses. |
Keratinocytes | Skin cells which produce the tough waterproof protein called keratin. Derived from basal cells. |
Melanocytes | Skin cells which produce the skin pigment melanin. |
Negative Feedback | When the outcome dampens or reduces the effects of the system. Crucial to maintain homeostasis |
Positive Feedback | When the outcome accelerates the effects of the system. Blood clotting, immune response, child birth. |