The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ______.
A. decreasing the distance for diffusion
B. changing the diffusion constant
C. increasing the concentration difference
D. increasing the surface area for diffusion
A. decreasing the distance for diffusion
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In seed plants the embryo develops inside the seed, which allows for:
A. less dispersal of the sporophyte generation. B. the development of dormancy. C. the dominance of the gametophyte generation. D. nutrient reserves for the developing embryo. E. greater protection for the developing embryo. F. the development of dormancy as well as nutrient reserves and greater protection for the developing embryo.
Between meals
a. the pancreas secretes glucagon. b. liver cells convert stored glycogen to glucose. c. the brain continues to receive adequate glucose. d. fatty-acid conversions supply about half of the ATP needed by muscle and liver cells. e. all of these occur.
WHICH OF THE FOLLOWING IS A POPULATION?
What will be an ideal response?
If the inner lining of the air sacs is neither thin nor highly vascularized, then what can be inferred about the air sacs?
A) They must not belong to the respiratory system. B) They cannot be derived from endoderm. C) They are not efficient sites of gas exchange between air and blood. D) They cannot effectively moisturize the air before it reaches the lungs.