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Unformatted text preview: May 7, 2007 Biology 130 Respiratory System (cont) • Boyle’s law o Increase volume will amount of molecules increases and vice verse • Contract diaphragm, increase space in thoracic cavity – breath in. Relax diaphragm, decrease space in thoracic cavity – breath out. • Flow air F = P atm – P avoli / R • Intrepleural pressure P ip is always below atmospheric pressure preventing the layers from collapsing – keeps the lungs open. about 4 mmHg lower than P atm • Dalton’s Law o Pressure created by each gas is independent of the other gas pressure – partial pressures o Proportions of gases – 78% N, 21 % O, 0.03% CO2 • Partial pressure gradients – 160 mmHg of O. Body works so that Oxygen gents passed through body as a gradient exerted by the partial pressures of the gases • Partial pressure of the gases depends on the temperature • The partial pressure of the gases not only depends on the concentration but also on how well the gas dissolves in water • Only 1% of oxygen dissolves in plasma. Only 1% of oxygen dissolves in plasma....
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- Spring '08
- high affinity, little oxygen, O. Body