Areolar connective tissue contains collagen, reticular, and elastic fibers and is able to hold lots of fluid within the extracellular matrix.
Loose connective tissue, which is made up of extracellular matrix and collagenous, elastic, and reticular fibres, serves to hold organs in place. Tendons and ligaments are made up of dense connective tissue, which is made up of a greater density of collagen fibres.
Collagen is the most abundant protein in skin, tendons, ligaments, cartilage, bone, and connective tissue. Collagen tissues can be stiff (bone) or compliant (tendon) depending on the degree of mineralization, or they can have a gradient from rigid to compliant. Collagen accounts for around one-quarter of all protein in our bodies.
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