Note Exchange Notes

Note Exchange Notes - Organs 11:27:00 ← Readings Ch 7 ←...

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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) cavity—separated 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 types—same 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 system—transporting things from one part of the body to another o Lymphatic and immune system—fight infections o Enocrine and Nervous—control everything in the body o Muscular system, skeletal system—movement, strength, protection o Digestive system o Urinary system—fluid 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 temperature—pours to sweat or restrict and dialate o Production of vitamin D o Sensation: provides info about external world • Structure—skin 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 fiber—intermediate fillament) which is waterproof o rapidly divide and are filled with fat ← •...
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Note Exchange Notes - Organs 11:27:00 ← Readings Ch 7 ←...

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