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Biology 3 ­ keywords

Active transport ­ the movement of substances against a concentration gradient
Aerobic ­ with oxygen
Alveoli ­ air sacs in the lungs. Oxygen diffuses into them and carbon dioxide diffuses
out of them
Anaerobic ­ without oxygen
Biogas ­ fuel produced from the anaerobic decomposition of…

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Urea ­ waste product of proteins formed in the liver and excreted in urine
Urine ­ water and waste products filtered by the kidneys
Villi ­ projections which stick out from the walls of the small intestine. Each villus
contains a network of blood capillaries for absorbing soluble food


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