CHEM 208 Lecture Notes - Lecture 5: Sulfur Dioxide, Dinitrogen Tetroxide, Nitrogen Dioxide
15 Nov 2016
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Document Summary
Alveoli: tiny sac like air spaces in the lungs that are separated from the pulmonary capillaries (i. e. , tiny vessels that connect the pulmonary veins and arteries and pass through the lungs) by a very thin layer of epithelial cells. They are the functional part of the lungs and act as gas exchange units. Atmosphere: the mixture of gases extending from the earth"s surface. It is divided into several distinct layers (troposphere, stratosphere, etc. ), each separated by a region known as a pause (e. g. , the tropopause separates the troposphere and the stratosphere). While each layer can be related to a particular altitude region, the criterion for separation is actually based on temperature variations. Concentrations: a measure of the amount of a substance within a given volume. Air (which all of us must breathe) composes the atmosphere and is a complex mixture of gases surrounding the earth.
