Diffusion rate across the respiratory membrane is rapid because ________.
A. alveoli are one cell thick
B. there are about 750 square feet of alveoli membrane
C. the air-blood barrier is two cells thick
D. All of the choices are correct.
Answer: D
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Indicate whether the statement is true or false
Collections of specialized cells and extra-cellular substances around them are known as a(n) ______
A. organelle B. tissue C. organ D. organism
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A. Left coronary artery B. Left coronary vein C. Great cardiac vein D. Right coronary vein E. Right coronary artery