BIOL 305 Lecture Notes - Lecture 4: Gastrointestinal Tract, Cartilage, Chondrocyte
29 Sep 2015
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Document Summary
Four primary tissues: epithelia (skin, line cavities and cover surfaces, glandular epithelia. Exocrine glands - secrete into ducts to exterior of body. Endocrine glands - secrete into blood to carry chemicals. Composed of proteins secreted by epithelial cells and connective tissue. To epithelial layer: attaches to underlying tissues: cell junctions - hold adjacent cells together. Produces blood cells: connective, functions, contains cells embedded in nonliving extracellular matrix, fibrous connective tissue. Elastic/collage fibers and cells embedded in gel-like substance (matrix: four types. Loose: surrounds many organs, lines cavities around blood vessels. Dense: forms tendons, ligaments, deeper layers of skin. Elastic : surrounds stomach and bladder, maintains shape. R : makes up internal framework of soft organs (liver) and lymphatic: specialized connective tissues. Cartilage: composed of chondrocytes (make collagen), no blood vessels. Bone: inorganic matrix with calcium salts for hardness. B : fluid matrix of plasma, red cells, white cells, and platelets.
