Whether there is a net flow of fluid into or out of a capillary at a given point along its length depends upon
A) whether the fluid contains nutrients or wastes.
B) whether or not the fluid contains oxygen.
C) the balance between blood pressure and osmotic pressure.
D) the needs of the tissue.
Answer: C
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Increased carbon dioxide concentrations may contribute to
a. ozone depletion. b. global warming. c. eutrophication. d. groundwater contamination. e. biomagnification.
Which biome has the least primary productivity?
a. tundra b. taiga c. grassland d. desert e. tropical rain forest
Diffusion during which the substance to be transported binds selectively to a membrane-spanning protein, which helps the process along, is called ________.
a) simple diffusion b) active transport c) facilitated diffusion d)facilitated osmosis e) osmosis
The various endemic cichlid species of Lake Victoria have suffered losses in their population numbers and species due to the introduction of
A. a new ectoparasite that lives on the gills. B. a new algae species. C. a fish hawk. D. the Nile crocodile. E. the Nile perch.