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bio3.23 - Respiratory System Moist skin Gills-Aquatic...

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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
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