Ahearn, Gregory A. Department of Biology, University of North Florida, Jacksonville, Florida.
Last reviewed:April 2020
- Structural aspects
- Kinds of transport
- Mechanisms of ion absorption
- Mechanisms of water absorption
- Mechanisms of nutrient absorption
- Related Primary Literature
- Additional Reading
The net movement (transport) of water and solutes from outside an organism to its interior. The unidirectional flow of materials into an animal from the environment generally takes place across the alimentary tract, the lungs, or the skin. In each location, a specific cell layer called an epithelium (Fig. 1) regulates the passage of materials. See also: Cell (biology); Epithelium; Respiration
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