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histology study of tissues epithelial makes up the surfaces of many body parts avascular lacking blood vessels free surface top surface of older cells basal surface bottom surface of newest cells, attaches to to another tissue simple squamous flat cells only one cell layer thick, allow for diffusion, not much protection, used to line blood vessels simple cuboidal cells are thicker and cube shaped, allow for diffusion, also used for absorption and secretion ->kidneys simple columnar tall cells shaped like columns, produce mucus, found in the lining of the stomach and intestines stratified epithelial layered epithelial, barrier as against water & UV rays -> epidermis of skin pseudostratified epithelium false layered tissue, use mucus to trap particles in the air -> airways of lungs exocrine glands secrete substances outward through a duct endocrine glands DUCTLESS, secrete hormones directly into blood connective tissue holds us up and holds us together, insulates connective tissue proper loose connective, adipose, dense regular, & dense irregular loose regular contain collagen and elastic fibers -> connect skin to underlying muscle dense irregular give strength in all directions -> in the skin/dermis dense regular fibers line up in the same direction, function is for strength -> tendons and ligaments adipose "fatty tissue" -> energy storage & insulation, kidneys and under skin hyaline much collagen like hard plastic -> bridge of nose and cartilage of ribs fibrocartilage cushion and absorbs shocks -> discs between vertebrae in back elastic cartilage not much collagen, more elastic fibers; flexible support -> outer ear and tip of nose bone "osseous tissue", secrete ground substance- harden through calcification blood "vascular tissue", red & white cells, clots blood mucus membranes open to the outside of the body -> mouth, stomach, digestive tract, urine tracts, etc. serous membranes reduces friction between organs -> found around heart and abdominal organs synovial membranes used for lubricating -> in moveable joints neurons highly specialized nerve cells, generate and conduct nerve impulses supporting cells support, insulate, and protect skeletal muscle attached to bones, cause skin movement; striated in appearance, VOLUNTARY cardiac muscle found only in the walls of the heart -> propel blood throughout blood vessels, INVOLUNTARY smooth muscle NO visible striations, walls of hollow organs -> digestive tract, uterus; INVOLUNTARY