bio3.23 - Respiratory System • Moist skin •...

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Unformatted text preview: Respiratory System • Moist skin • Gills-Aquatic animals-Extensions of the body for circulatory exchange • Tracheae-Insects-Branching internal tubes that deliver air-Air enters tracheae through spiracles • Lungs-Amphibians, reptiles, mammals, birds-Internal sacs lined with moist epithelium-Capillaries found just below epithelium • Human Respiratiory System • Conducting Portion • Series of passageways that carry air into and out of the gas-exchange portion • Brings air to lungs • Contains apparatus that makes speaking possible • Nasal cavity • pharynx • Larynx • Trachea • Bronchi: 2, right and left • Bronchioles, smaller tubes • Gas Exchange Portion • Where gases are exhachaged with he blood in tiny sacs in the lungs • Alveoli-300 million-Respiratory surface-Covered by capillaries • Across two cell layers Oxygen Transport and Exchange • Oxygen transported in blood bound to hemoglobin • Exchange in lungs • Exchange in body cells Carbon Dioxide Transport and Exchange • Transport-Carried by hemoglobin-Carried in plasma as HCO3-Dissolved in plasma • Exchange in lungs...
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This note was uploaded on 04/20/2008 for the course BIO 301L taught by Professor Wandelt during the Fall '07 term at University of Texas.

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bio3.23 - Respiratory System • Moist skin •...

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