A local bronchodilation within the alveolus will result in a(n) ________ in the ventilation-perfusion ratio in that region. A vasoconstriction of pulmonary arteriole diameter will result in a(n) ________ in the ventilation-perfusion ratio in that region.
A) lack of change : increase
B) increase : increase
C) increase : decrease
D) decrease : increase
E) decrease : decrease
Ans: B) increase : increase
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What event immediately precedes the nerve firing an action potential?
A. Depolarization is initiated. B. The threshold potential is reached. C. Volted-gated Na+ channels close. D. Volted-gated K+ channels open. E. The membrane becomes hyperpolarized.
The purines of DNA are
A. adenine and guanine. B. thymine and adenine. C. serine and threonine. D. thymine and uracil. E. thymine and adenine AND thymine and uracil.
A(n) ___________ has been established if more solute is located outside of the cell than inside of the cell.
a. concentration gradient b. diffusion gradient c. active transport gradient d. facilitated gradient
The broad categories of grasses, shrubs, and trees represent a diverse range of species and characteristics, and they have fundamentally different patterns of
A) nutrient allocation and morphology. B) carbon allocation and morphology. C) carbon allocation and nutrient allocation.