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BIOL 2050U
Peter Cheung

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Tissues  Connective Tissue (CT) binds to and supports body parts  Muscle Tissue protects joints, produces movement and heat  Nervous Tissue responds to stimuli and transmits impulses from one body part to another  Epithelial Tissue covers body surfaces and lines body cavities  Skin is an organ o Epidermis of skin is made of stratified squamous epithelium o New cells are pushed outward, become keratinized, die and are rubbed off Classification of Epithelium  Simple epithelium: Composed of a single cell layer o Found in the alveolar (air sacs) wall of the lung o Increases rate of diffusion by increasing surface area and reducing diffusion pathway  Stratified epithelium: Composed of multiple cell layers o Provide protection  Squamous: Cells have a flattened appearance, with a flattened nucleus  Cuboidal: Cells appear as a cube, the nucleus is spherical  Columnar: Cells are column shaped with an elongated nucleus  Cilia: Small projections that can move small substances o Lines the respiratory tract o Cleans impurities by moving them upwards, towards the throat Blood  Is a connective tissue containing different cell types (erythrocytes, lymphocytes, monocytes, granulocytes) Blood Plasma  Plasma is aq containing proteins, inorganic salts, amino acids, vitamins, hormones  Main plasma proteins are albumin, globulins, and fibrinogen o Albumin maintains osmotic pressure and acts as a transport protein for various substances o Globul
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