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TISSUE The Living Fabric
Four Types of Tissue Epithelial (protection) Connective (support) Muscle (movement) Nervous (control)
Epithelial Tissue Covering & Lining Epithelium Glandular Epithelium
Classified by: Shape Number of Layers
Squamous Flattened and Scalelike
Cuboidal As tall as they are wide
Culumnar Tall, Column-Shaped
Arrangement Simple Stratified
Functions of Epithelium Protection Absorption Secretion Sensory Functions
Features of Epithelium Cell Junctions are Tight Basement Membrane Avascular (no vessels) Highly Regenerative
Covering and Lining Epithelium
Location Endothelium: Simple, Reduces Friction (Vessels) Mucous Membranes: Line body cavities that are open to the exterior. (Mouth, Nose)
Location Cutaneous Membrane: Skin, Keratinized stratified squamous, dry membrane Serous Membrane: Moist, Closed ventral body cavities, Reduce friction
Glandular Epithelium Specialized for Secretion One or more epithelial cells Exocrine: Ducts (Saliva glands, Pancreas) Endocrine: Ductless, Directly into Extracellular Space (Hormones)
General Properties Most abundant and varied of all tissues Primary function: bind the other tissues or the body.
Matrix: Nonliving, extracellular material, separates cells of the tissue. Allows tissue to bear weight, tension, and endure abuses
Connective tissues develop from embryonic tissue known as MESENCHYME
CELLS 1. Fibroblasts: produce fibers and carbs and protein constituents of matrix
Chondroblast: Cartilage Osteoblast: Bone Hemocytoblast: Blood
FIBERS Collagen – Most abundant – White fibers – Tough, inelastic
FIBERS Reticular – Finely branched – Composed of collagen – EX. Basement membrane, small blood vessels
FIBERS Elastic – Yellow fibers – Elastin (protein) – Ex. Skin, lungs, vessels
Types of C.T. Connective Tissue Proper Two subclasses:
Loose connective (areolar, adipose, reticular) Dense connective (Dense regular, Dense irregular, Elastic)
Dense regular connective
Cartilage : tough yet flexible, avascular – Chondrocytes – Perichondrium: well- vascularized dense irregular connective tissue membrane
Bone Main supporting tissue Compact bone & spongy bone Well supplied by blood vessels
Blood Blood and lymph are circulating connective tissues Red marrow-blood cells
Muscle Tissue Skeletal: Voluntary control, attached to bone.
Cardiac: Involuntary, Heart, branched cells joined end to end.
Smooth: Involuntary – Lining of organs, vessels
Nervous Functions – Receive stimuli – Transmit info – Control action of muscle and glands
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