BILD 2 Handout 1

BILD 2 Handout 1 - BILD 2 Handout 1 TA: David Kim...

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BILD 2 Handout 1 TA: David Kim ( hyk018@ucsd.edu ) OH: TBD Systems have a large surface area to increase rate of diffusion -As a cell grows in size, surface area/volume ratio decreases so it is more difficult to provide needed materials/rid itself of toxic substances. Tissues of the body (4 main categories) 1. Epithelial -Protects the internal environment -Regulate exchange of material -Manufacture and secrete chemicals -Types of epithelial tissues Cuboidal Dice-shaped Specialized for secretion Common in glands Simple Columnar Long, cylindrical cells Large cytoplasmic area ideal for secretion and absorption Found in intestinal tract Pseudostratified ciliated columnar Includes mucous membrane and cilia Traps foreign materials and propels away from internal environment Found in respiratory tract and female reproductive tract Stratified Squamous Multi-layered with overlapping cells High degree of regenerative capacity
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Protective, barrier function Found in surface of skin, parts of GI tract Simple Squamous Thin cells; relatively leaky junctions between cells Ideal for exchange Line blood vessels and lung alveolar cells 2. Connective (a form of fibrous tissue) -Spread throughout the extracellular matrix -Provides structural support and barrier -3 Types of Fibers 1) Collagen Fibers 2) Elastic Fibers 3) Reticular Fibers Adipose tissue: loose connective tissue for storing fat 3. Muscle -Can generate and propagate electrical signals -Ability to contract, produce force and movement -Types -skeletal muscle: striated, very large cells with many nuclei, each one causes a contraction which shortens the muscle -cardiac muscle: striated and similar to skeletal, different muscle cells attached with junctions, intercalated disk (gap junctions- help relay signals from cell to cell to help synchronize the heartbeat) -smooth muscle: not striated, involuntary (autonomic control), makes up walls of internal organs ( arteries, veins, urinary and genial tract) 4. Nervous
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BILD 2 Handout 1 - BILD 2 Handout 1 TA: David Kim...

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