Biology 1225 Chapter Notes - Chapter 19: Dermis, Simple Squamous Epithelium, Fibroblast
26 Jul 2015
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Animal structure and function: bilateral animals, including vertebrates, develop from an embryo that has three tissue layers. Evolution of structure and function: traits that help individuals survive and reproduce in their environment tend to be preferentially passed on, evolution typically does not produce entirely new tissues or organs. Instead it modifies the structure and function of existing ones for new purposes, a process called exaptation. These cells function in the absorption and secretion of substances. Their free surface often has cilia or microvilli: page 377. Connective tissue: page 378, are the most abundant tissues in vertebrate body, their cells are separated from one another by a secreted extracellular matrix, loose connective tissue, most common, holds organs in place and underlies epithelia. In addition to its energy storage role, adipose tissue cushions body parts, and a layer of adipose tissue beneath the skin serves as insulation: bone tissue, connective tissue in which a calcium-hardened extracellular matrix surrounds each cell.
