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Biological transport
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A quality of cell membranes which permits the passage of solvents and solutes into and out of cells
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The tendency of a gas or solute to pass from a point of higher pressure or concentration to a point of lower pressure or concentration and to distribute itself throughout the available space. Diffusion, especially FACILITATED DIFFUSION, is a major mechanism of BIOLOGICAL TRANSPORT
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Exchange of substances between the maternal blood and the fetal blood at the PLACENTA via PLACENTAL CIRCULATION. The placental barrier excludes microbial or viral transmission
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Membrane proteins whose primary function is to facilitate the transport of molecules across a biological membrane. Included in this broad category are proteins involved in active transport (BIOLOGICAL TRANSPORT, ACTIVE), facilitated transport and ION CHANNELS
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-- See Also the narrower term Secretion
--subdivision Secretion under individual chemicals and groups of chemicals, e.g. Copper--Secretion; also subdivision Secretions under individual organs and regions of the body, e.g. Heart--Secretions; and individual secretions, e.g. Bile; Perspiration
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