Note Exchange Notes - Organs 27/02/2008 11:27:00 Readings:...

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Unformatted text preview: Organs 27/02/2008 11:27:00 Readings: Ch 7 Organs Formed from at least two tissue types that function together Most organs are housed in body cavities o Dorsal (back) cavity Cranial cavity Spinal cavity o Ventral (front) cavityseparated from dorsal cavity by diaphragm Thoracic cavity Abdominal (Abdomino-pelvic) cavity Tissue Membranes Line body cavities Sheets of epithelium supported by connective tissue Form physical barriers that protect underlying tissues 4 typessame general structure, found in different part of the body and differ in functions o Mucous membranes Line passageways that open to exterior (Functions: lubricate, trap collecting debris so that cilia can move debri out of respiratory airway) o Serous membranes Line and lubricate body cavities and organs within o Synovial membranes Line cavities between bones of freely movable joints (fluid filled cavity) o Cutaneous membranes Skin Covers outside of body Q: Which type of tissue membrane would you find lining the thoracic and abdominal cavities? Mucous membrane Serous membrane Synovial membrane Cutaneous membrane Organ system Two or more organs that work together for a common function 11 major organ systems o Circulatory systemtransporting things from one part of the body to another o Lymphatic and immune systemfight infections o Enocrine and Nervouscontrol everything in the body o Muscular system, skeletal systemmovement, strength, protection o Digestive system o Urinary systemfluid balance o Respiratory system o Reproduction system o Integumentary System Integumentary (covering) system Composted of the skin and its derivatives Functions o Protection (against infection, dehydration) o Regulate body temperaturepours to sweat or restrict and dialate o Production of vitamin D o Sensation: provides info about external world Structureskin has two layers o Epidermis Thin outer layer of epithelial tissue (stratified squamous) Protective barrier Q: Which type of cell-cell junctions would you expect to find in between cells in the epidermis Tight junction o Adhesion junctions o Gap junctions Q: Surface epidermal cells of the skin rapidly divide o never divide and remain in place throughout lifetime o rapidly divide and are in place for only a short time o are dead and filled with keratin new cells made in dermis and old cells pushed to the top and die because they get less nutrients and get filled with keratin (cytoskeletol fiberintermediate fillament) which is waterproof o rapidly divide and are filled with fat...
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Note Exchange Notes - Organs 27/02/2008 11:27:00 Readings:...

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