With what you have learned about pulmonary ventilation, how would you design an artificial respirator to keep patients with paralyzed respiratory muscles alive? How does artificial respiration by a machine compare to mouth-to-mouth respiration?
What will be an ideal response?
The artificial respirator needs to alternate the pressure it generates between slightly higher than atmospheric pressure and slightly lower than atmospheric pressure. These pressure fluctuations are what the respiratory system normally produces; thus they should be safe for the respiratory structures. The lungs of the patient will passively inflate and deflate in response, and gas exchange at the alveoli will occur. The principle is the same with
mouth-to-mouth respiration.
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What will be an ideal response?
Which of the following is NOT true of cones?
A. Cones are responsible for sharp vision. B. Cones are much more numerous than rods in the peripheral portions of the retina. C. Only cones are found in the fovea centralis. D. They provide for color vision. E. All of these are true of cones.
In a redox reaction, when one reactant is oxidized, the other
A. is also oxidized. B. releases chemical energy in the form of ATP. C. is reduced. D. is hydrolyzed into a smaller molecule. E. becomes a larger, more complex molecule.