The portion of the tidal volume that does not participate in pulmonary gas exchange is called:

A. vital reserve.
B. residual air.
C. dead space air.
D. inspiratory reserve.

Answer: C. dead space air.

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The ability of the cell membrane to change to allow the movement of ions is called:

A. permeability. B. changeability. C. polarity. D. amorality.

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The third stage of mitosis is called ________. During this stage, the replicated chromosomes are pulled toward the centrioles at opposite sides of the cell. 

Fill in the blank(s) with the appropriate word(s).

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