5l of blood rate of blood ow through lungs is much

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Unformatted text preview: are not damaged by cold air) •  Humidify it (add water vapor un(l reaches 100% humidify, so exchange epithelium does not dry out •  Filter the inspired air (rid of foreign material like viruses, bacteria, inorganic par(cles) –  Ciliated epithelium are bathed in a watery saline layer •  Epithelial cells secrete Cl- and water follows, disrup(on of these channels causes cys(c fibrosis –  Inadequate fluid, cilia trapped in mucus, bacteria colonize airways Alveoli •  Sites of gas exchange –  Single layer of epithelium •  Type I cells (95%) are so thin gas can diffuse through •  Type II cells (5%) release surfactant •  Alveoli neighbor capillaries and blood vessels fill 80- 90% of space between alveoli, forming a sheet of blood in close contact with airy- alveoli Pulmonary Circula(on: Mad flow, low pressure •  At any given moment, pulmonary circula(on contains 0.5L of blood •  Rate of blood flow through lungs is much higher than other (ssues because lungs receive the en(re CO of the right ventricle (5L/min) –  As much blood flows through the lungs as does the en(re rest of the body in the same amount of (me •  Despite this, pulmonary pressure is low (25/8 mm Hg) –  Right ventricles doesn’t have to pump as intensely because resistance is low (shorter distance and large cross- sec(onal area for flow) Gas laws 1.  Ideal Gas Law: PV = nRT Pressure and Volume are inversely related V = 1/P 2. Pressure and...
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This note was uploaded on 11/12/2013 for the course BIOS 281 taught by Professor Varamini during the Fall '12 term at Biola University.

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