In trying to differentiate between chronic bronchitis and emphysema, you know that chronic bronchitis:
1. usually occurs after age 50 and has insidious progressive dyspnea.
2. usually presents with a cough that is mild and with scant, clear sputum, if any.
3. presents with adventitious sounds, wheezing and rhonchi, and a normal percussion note.
4. results in an increased total lung capacity with a markedly increased residual volume.

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Which sequence correctly shows the path of carbon dioxide during repiration?

Name the part of the the brain labeled "e".