The percent oxygen saturation of hemoglobin is highest in the:
a. tissues where oxygen concentration is lowest.
b. tissues where oxygen concentration highest.
c. venules where oxygen concentration lowest.
d. pulmonary capillaries where oxygen concentration lowest.
e. pulmonary capillaries where oxygen concentration highest.
E
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Examine Figure 25.10, which shows the parallel history of atmospheric CO2 levels and surface temperature over the last 400,000 years based on measurements of air bubbles trapped in glacial ice sheets in Antarctica
Select the correct item from each of the following pairs. Glacial expansion correlates with [increasing / decreasing] amounts of CO2 in the atmosphere and temperatures [higher / lower] than those measured in 1950. As glaciers advance, it is thought that the oceans circulate [more slowly / more vigorously], causing deep ocean carbon reservoirs to [increase / decrease]. What will be an ideal response?
The Sec system is used by ________.
A. neither Gram-positive nor Gram-negative bacteria B. Gram-positive bacteria only C. both Gram-positive and Gram-negative bacteria D. Gram-negative bacteria only
Red blood cells differ from white blood cells in that red blood cells
A) are more numerous. B) are larger. C) defend the body from disease. D) have a nucleus. E) are produced in the liver.
In general, the vessels that return blood to the heart in a closed circulatory system are referred to as
A. capillaries. B. arteries. C. auxiliary hearts. D. veins. E. sinuses.