The Following Questions Refer to the Data Shown Below Figure 421
-Birds Have Negative Pressure Breathing, but It Differs from Entering

question 64

Multiple Choice

The following questions refer to the data shown below.
Blood entering a capillary bed of a vertebrate was measured for the pressures exerted by various factors.
$$\begin{array} { l c c } & \begin{array} { c } \text { Arterial End of } \\\text { Capillary Bed }\end{array} & \begin{array} { c } \text { Venous End of } \\\text { Capillary Bed }\end{array} \\\hline \text { Hydrostatic pressure } & 10 \mathrm {~mm} \mathrm { Hg } & 14 \mathrm {~mm} \mathrm { Hg } \\\text { Osmotic pressure } & 26 \mathrm {~mm} \mathrm { Hg } & 26 \mathrm {~mm} \mathrm { Hg } \\\mathrm { PO } _ { 2 } & 100 \mathrm {~mm} \mathrm { Hg } & 42 \mathrm {~mm} \mathrm { Hg } \\\mathrm { PCO } _ { 2 } & 40 \mathrm {~mm} \mathrm { Hg } & 46 \mathrm {~mm} \mathrm { Hg }\end{array}$$
Figure 42.1
-Birds have negative pressure breathing, but it differs from that of mammals and is more efficient because of which of the following reasons?

• A)The bird's mouth movements are able to force air into the lungs.
• B)The tidal volume in birds is much larger than in a comparably sized mammal.
• C)The maximum PO2 is significantly higher in bird lungs.
• D)The flow of air in a bird's lungs is from posterior to anterior.
• E)The brain of the bird maximizes oxygen uptake more efficiently.

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