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8 Cards in this Set
- Front
- Back
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External respiration |
Gas exchange between air in lungs and blood |
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Internal respiration |
Gas exchange between blood and cells of body |
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Inspiration |
Active process-muscles increase volume of thorax, decreasing lung pressure, which causes air to move from atmosphere into lungs (down pressure gradient). |
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Expiration |
Reduction in size of thoracic cavity decreases its volume and this increases it’s pressure, so air moves down the pressure gradient and leaves the lungs |
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Exchange of gases in lungs |
Carbaminohemoglobin breaks down into carbon dioxide and hemoglobin. Carbon dioxide leave the body through lung capillaries. Oxygen moves from alveoli into lung capillaries and combines with hemoglobin producing oxyhemoglobin |
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Gas pressure |
Total pressure of all gases present in air or blood sample is sum of pressure exerted by each of gasses present. Pressure of Respiratory gases constitute only part of pressure present |
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Transport of oxygen |
Only small amounts of oxygen can be dissolved in blood. Most oxygen combines with hemoglobin to form oxyhemoglobin to be carried in blood |
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Transport of carbon dioxide |
Dissolved carbon dioxide-10%. Carbaminohemoglobin (20%). Bicarbonate ions (70%) |
