External and Interal Respiration
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7 Terms
External respiration
Gas exchange occurs across the respiratory membrane of the alveolus - gas exchange between air in lungs and in capillaries
How does gas move in external respiration
Moves down pressure gradient by passive diffusion, oxygen moves from alveoli to blood and carbon dioxide moves from blood to alveoli
Henry’s law
Amount of gas that dissolves in water is determined by its solubility in water and its partial pressure in air, oxygen is sparingly soluble in water and carbon dioxide is more soluble in water
Blood in capillaries vs inspired air in alveoli for external respiration
PO2 = 40mmHg → 100mmHg
PCO2 = 45mmHg → 40mmHg
Internal respiration
Gas exchange between blood in capillaries and cells in body tissues
Pressure gradient for internal respiration
Oxygen moves form blood to tissues and carbon dioxide moves from tissues and cells to blood
Gas inside cells vs gas in capillaries for internal respiration
PO2 = 40mmHg → 95mmHg
PCO2 = 45mmHg → 40mmHg