McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

How do single-celled organisms exchange gases?

A. simple diffusion alone
B. diffusion coupled with exchange channels in the plasma membrane
C. microscopic gas channels in the cytoplasm
D. by countercurrent exchange mechanisms


2. How do fish exchange gases with water?

A. respire through skin when near the air-water interface
B. using gills and countercurrent exchange
C. through an extensive tracheal system
D. using a large respiratory surface in gills only
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