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1
Through which one of the following respiratory structures can oxygen diffuse into the blood?
A)Lungs
B)Tracheae
C)Body surface
D)Gills
E)Oxygen can diffuse into the blood through all of these structures.
2
Which one of the following statements about gas exchange is incorrect?
A)Aquatic animals typically have less oxygen available to them than do terrestrial animals.
B)Respiratory organs are typically adapted in some way to increase surface area for gas exchange.
C)The rate of oxygen diffusion decreases as the altitude increases.
D)Diffusion of oxygen and carbon dioxide across body surfaces typically occurs in organisms that are a single cell layer or a few cell layers thick, but can also occur in some larger, more complex animals.
E)All of these statements about gas exchange are correct.
3
Primary gas exchange in a mammalian respiratory system typically takes place in the
A)alveoli.
B)bronchi.
C)larynx.
D)bronchioles.
E)trachea.
4
True or False: Tidal ventilation in mammals is more efficient than unidirectional flow through systems utilized by fish.
A)True
B)False
5
Hemoglobin has __________ subunit(s) and can carry a total of ___________ oxygen molecule(s).
A)1; 1
B)1; 4
C)2; 2
D)4; 4
E)4; 1
6
Which one of the following does occur when a human relocates to a higher altitude?
A)Increase in ventilation
B)Increase in capillary density
C)Increase in myoglobin content in muscle
D)Increase in hematocrit
E)All of the choices occur when a human relocates to a higher altitude.
7
True or False: Asthma is believed to be a genetically inherited and the result of an imbalance in the immune system.
A)True
B)False





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