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Transport Glossary
DIFFUSION The net movement of molecules from an area
of high concentration to one of low
SURFACE-AREA-TO-VOLUME RATIO Some animals have a large surface area
compared with their volume. The ratio is
affected by shape of the animal
LUNGS Allow air in and out of the body,…

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SINGLE CIRCULATORY SYSTEM In fish: blood flows from heart to gills and then
to the body before returning to the heart
DOUBLE CIRCULATORY SYSTEM Two circuits; one carries blood to the lungs to
pick up oxygen (pulmonary circulation)
The other circuit carries the oxygen around the
body and to the…


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