Partial pressure: the pressure exerted by each type of gas in a mixture, dalton's law, water vapor pressure.
Diffusion of gases through liquids: concentation of gas in a liquid is determined by its partial pressure and its solubility coefficient. Henry's law
physical principles of gas exchange
minute and alveolar ventilation
Minute ventilation : total amount of air moved into and out of respiratory system per minute. Respiratory rate or frequency : number breaths taken per minute. Anatomic dead space : part of respiratory system where gas exchange does not take place.
Alveolar ventilation : how much air per minute enters the parts of the respiratory system in which gas exchange takes place.
residual volume
volume of air remaining in respiration passages and lungs after the most forceful expiration
inspiratory reserve volume
amount of air inspired forcefully after inspiration of normal tidal volume
pulmonary capacities
Inspiratory capacity: tidal volume plus inspiratory reserve volume. Functional residual capacity: expiratory reserve volume plus the residual volume. Vital capacity: sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume . Total lung capacity: sum of inspiratory and expiratory reserve volumes plus the tidal volume and residual volume.
invertebrates respiratory system
Sponges do not have speciliazed respiratory organs. Simple diffusions is enough to support all cells with oxygen. Water flows into a sponge througt side openings and out of the top opening osculum. The water current provides both food and oxygen removes waste products. All of the cells in the sponge obtain their oxygen from the circulated water. Flatwarms also do not need respiratory organs as like lungs or gills, simple diffusion occur for gas exchange.
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