Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia.
the absorption of drugs, allergens, and other substances through unbroken skin. The corneal layer of epidermis is the principal barrier.
Synonym(s): cutaneous absorption
the process of absorption through the skin from topical application.
absorption(ab-sorp'shon) [L. absorptio]
1. The taking up of liquids by solids, or of gases by solids or liquids.
2. The taking up of light or its energy by black or colored rays.
3. The taking up by the body of radiant energy, causing a rise in body temperature.
4. The reduction in intensity of an x-ray photon as it passes through a substance or a beam of light as it passes through a solution (used in clinical photometry as well as nuclear methods).
5. The passage of a substance through some surface of the body into body fluids and tissues, such as the diffusion of oxygen from the alveolar air into the blood, or the active transport of amino acids from food through the epithelium of the small intestine.
The taking up of the monosaccharides by the brush border of the small intestine.
The uptake of water, electrolytes such as sodium, amino acids, and some drugs by the mucosa of the large bowel.
Absorption through the skin. Synonym: percutaneous absorption
Absorption of material by the skin and mucous membrane.
The taking up of glycerols and fatty acids, suspended in bile salts, into the villi of the small intestine.
Absorption of water, alcohol, and some salts through the gastric mucosa.
Oral or buccal absorption of materials or medicines such as nicotine or nitroglycerin. Alkaloids are better absorbed through the oral mucosa than acidic chemicals.
Absorption of fluids, electrolytes, and nutrients from a site other than the gastrointestinal tract.
Absorption of a substance normally excreted (e.g., urine) or of a product of disease processes (e.g., pus) into the blood or lymph.
percutaneous absorptionCutaneous absorption.
The taking up of amino acids—singly, or linked as dipeptides or tripeptides—by the brush border of the small intestine.
small intestinal absorption
The uptake of water, fatty acids, monosaccharides, amino acids, vitamins, and minerals from the lumen of the gut into the capillary networks and lacteals of the villi. The small intestine is the major site of nutrient absorption in the body.
1. the act of taking up or in by specific chemical or molecular action; especially the passage of liquids or other substances through a surface of the body into body fluids and tissues, as in the absorption of the end products of digestion into the villi that line the intestine.
2. in radiology, uptake of energy by matter with which the radiation interacts.
any process by which one substance in liquid or solid form penetrates the surface of another substance.
Compton absorption effect
see compton effect.
the difference in the absorption of x-rays by different tissues.
the passage of the end products of digestion from the gastrointestinal tract into the blood and lymphatic vessels and the cells of tissues. Absorption of this kind can take place either by diffusion or by active transport.
a passive process in which noxious or therapeutic substances pass through the skin into the body.
the dissipation of radiant energy as it passes through matter. This phenomenon is of particular importance in diagnostic and therapeutic radiology, which depends on the interaction between ionizing radiations and matter. As radiation passes through matter, it is absorbed by an amount dependent on the atomic and molecular structure and thickness of the substance, and the energy of the primary photons. If radiations pass through a medium of living or nonliving material without absorption (loss of energy), no biological or photographic effects can occur. In true absorption the photons of radiation waves give up or transfer all of their energy to electrons within the atoms of the matter through which they are passing.