PSL301H1 Lecture : Lec 1

32 views5 pages

raspberrycamel287

15 Dec 2011

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

heliakhibari and 40061 others unlocked

PSL301H1 Full Course Notes

Verified Note

41 documents

Document Summary

Primary function of the lungs (cid:131) remember: function determines structure, and structure determines function (cid:131) the primary function of the lungs is to exchange gases between blood and air. 5% in blood (cid:131) gas exchange occurs by passive diffusion across the alveolar membrane separating air and blood. No gas exchange occurs and so they make an anatomical dead space (more later on that). The alveolar wall (cid:131) for gas exchange, the pulmonary capillaries form an almost continuous sheet covering the walls of the alveoli: minimize thickness of the alveolar membrane to maximize gas transfer. Pulmonary defence systems (cid:131) because of its large surface area of delicate tissues, the lungs must be defended against air pollution: once damaged, lung tissue rarely recovers (smokers never regain lost lung function). In the alveoli, particles are engulfed by macrophages. (cid:131) many occurring exocytosis prevents gas exchange and causes lung problems. = inspiratory reserve volume + expiratory reserve volume + tidal volume.

Related Questions

Assume that the atmosphere has a temperature (T = 235 K) that isindependent of altitude. The pressure of the atmosphere is the sumof the partial pressures of the gases present (N2, O2, etc.). Thepartial pressure of each type of gas varies with altitude, h,according to the condition of constant chemical potential.

Define h(N2) as the altitude at which the partial pressure ofnitrogen (28 g/mole) falls to 1/2 of its value at sea level. Defineh(H2) as the altitude at which the partial pressure of hydrogen (2g/mole) falls to 1/2 of its value at sea level.

What is the difference between h(H2) and h(N2)?

I had difficulty with the following problem. I do not knowhowpressure relates to wavelength or refractiveindex.

4. At a pressure of 1 atm (atmosphere) therefractive indexof pure hydrogen gas is 1.0001360. Pure

oxygen gas has a refractive index of 1.0002641 at 1atm.You can assume Sellmeier's equation and

the ideal gas law (temperature isconstant).

(a) At what pressure would you expect therefractive indexof pure oxygen gas to be 1.0005?

(b) Suppose we have a mixture of hydrogen andoxygen gas.The partial pressure of hydrogen is 4

atm and the partial pressure of oxygen is 2 atm(with atotal pressure of 6 atm). What do you

expectthe refractive index of this mixture to be?

A red blood cell of surface area 150 micrometer^2 is placed in asolution of 0.5M glycerol. If the diffusion coefficient across themembrane is 1.2x10^-12, what is the initial number of moleculescrossing the cell per unit time? assume the membrane is 12 nm thickand the concentration of glycerol inside the cell is0.304mol/dm^3

PSL301H1 Lecture : Lec 1

PSL301H1 Full Course Notes

Document Summary

Get access

Related Documents

PSL301H1 Lecture Notes - Lecture 16: Lung Volumes, Congenital Heart Defect, Pulmonary Vein

PSL301H1 Lecture Notes - Lecture 16: Venous Blood, Partial Pressure, Carbamino

PSL301H1 Lecture Notes - Lecture 16: Congenital Heart Defect, Carbonic Anhydrase, Vapor Pressure

Related Questions