BIOLOGY 20 Lecture Notes - Lecture 2: East Los Angeles College, Reticular Connective Tissue, Adipose Tissue
Document Summary
Ground substance- viscous, syrupy w/ fixed, wandering cells, fibers (reticular, Provides padding and cushions shocks; insulates (reduces heat loss); stores energy. Wherever you have a tendon (bone to bone) Reason skin doesn"t rip apart layer underneath stratified squamous aerola skin. Collagen long, straight, unbranched, high tensile strengthligaments, tendons. 29 types of collagen have been identified and described. Over 90% of the collagen in the body, however, are of type i, ii, iii, and iv. Collagen one: skin, tendon, vascular, ligature, organs, bone (main component of bone) endomysium, scar tissue. Collagen two: cartilage (main component of cartilage) Collagen three: reticulate (main component of reticular fibers), commonly found alongside type i. Collagen four: forms bases of cell basement membrane. Collagen five: cells surfaces, hair and placenta. Reticular collagen-like, thinner, branched, same subunits, interwoven, 3-d = stroma. Elastic wavy, branching, > 150% of resting, elastic ligamentsrare, individual elastic fibers all over.
