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HB: Chapter 4

TermDefinition
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.
Created by: dmainvil
 

 



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