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1. gas exchange
2. regulation of pH
3. voice production
pathway for air flow (10)
nose--->pharynx--->larynx--->trachea--->bronchi--->bronchioles--->terminal bronchioles--->respiratory bronchioles--->alveolar ducts--->alveoli
diaphragm relaxes & dome shape returns
thoracic cavity volume decreases
air pressure increases
ability of pulmonary tissue to stretch = inspiration
increase compliance = easier to stretch
easy to stretch, low in elastance
get a lot of air in, but hard to get out
elastance (elastic recoil)
tendency of pulmonary tissues to return to smaller size after being stretched = expiration
pressure exerted by a gas in a mixture of gases
influences the movement of air into alveoli
factors influencing oxygen diffusion
1. oxygen pressure gradient
2. total functional surface area
3. alveolar ventilation = breath slowly
4. thickness of respiratory membrane
found in RBC, convert Co2 & H2O into carbonic acid, which converts to bicarbonate
lack of oxygenation in tissues
stimulates formation of RBCs but must have hemoglobin to transport the oxygen
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