osmoregulation


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osmoregulation

 [oz″mo-reg″u-la´shun]
adjustment of internal osmotic pressure of a simple organism or body cell in relation to that of the surrounding medium. adj., adj osmoreg´ulatory.

osmoregulation

/os·mo·reg·u·la·tion/ (-reg″u-la´shun) adjustment of internal osmotic pressure of a simple organism or body cell in relation to that of the surrounding medium.osmoreg´ulatory

osmoregulation

(ŏz′mə-rĕg′yə-lā′shən)
n.
Maintenance of an optimal, constant osmotic pressure in the body of a living organism.

os′mo·reg′u·la·to′ry (-lə-tôr′ē) adj.

osmoregulation

[-reg′yəlā′shən]
Etymology: Gk, ōsmos, impulse; L, regula, rule
the act of influencing or controlling the speed and extent of osmosis.

osmoregulation

the control of OSMOTIC POTENTIAL or WATER POTENTIAL in organisms. Water molecules tend to move from an area of high osmotic or high water potential (low osmotic pressure) to an area of low osmotic potential or low water potential (highosmotic pressure), when separated by a differentially permeable membrane. Where cells are bathed in a solution, water tends to cross the cell membrane in order to equalize the water potential on either side.

In a dry atmosphere or the marine environment, organisms tend to lose water to their surroundings. In a wet atmosphere or in freshwater, organisms may have difficulty in losing water. Various means are thus adopted to maintain a correct water balance. Xerophytic plants (see XEROPHYTE).may reverse the normal stomatal rhythm, develop a waxy cuticle, fold leaves, store water (succulent plants) or survive dry periods as spores or seeds. Excess water may be removed by GUTTATION in some plants, and by CONTRACTILE VACUOLES in some unicellular organisms. In mammals osmoregulation is carried out by the kidney, water passing out of the blood stream into the kidney tubule via the BOWMAN'S CAPSULE and reabsorbed, where necessary, in the tubule itself. Marine fish, reptiles and birds are able to eliminate salt through special excretory cells. Different groups of animals remove NITROGENOUS WASTE in different ways - all associated with osmoregulation. Many marine organisms have blood that is ISOTONIC with sea water, and so do not have an osmoregulatory problem.

osmoregulation

adjustment of internal osmotic pressure of a simple organism or body cell in relation to that of the surrounding medium.
References in periodicals archive ?
Many scientists have used the silver nitrate staining method as a reliable tool to ascribe the function of osmoregulation to the anal plates or anal organs of many dipterans (Simmin 1951; Stoffolano 1970; Komnich 1977; Bradley 1985; Schwantes 1989; Schwantes & Seibold 1989; Reeves 2008).
1,15) Osmoregulation is the regulation of the balance of water and electrolytes, and is of primary importance in the animal's overall homeostasis to maintain a constant fluid volume and composition in each compartment, which is achieved through a balance between intake of water, solutes, and nutrients, and excretion of these substances and their end-products.
Machado et al (2010) working with giardia, postulated that thymol altered plasma membrane osmoregulation without impacting mammalian plasma membrane function.
They perform vital functions such as respiration, osmoregulation and excretion, and are also the contaminant depuration site, where the detoxification and metabolism of toxic agents can take place (PACHECO, SANTOS, 2002; MELETTI et al.
of New York, US), and Rao (Bedford Institute of Oceanography, Canada) present 21 papers discussing state-of-the-art research in selected topics concerning the unicellular green flagellate of the genus Dunaliella, which is studied as a model for osmoregulation, pigment production, and for commercial mass cultures because of its unique features of extremophilia and pigment change.
Endocrine control of osmoregulation in teleost fish.
Influence of ambient salinity on osmoregulation and cortisol concentration in yearling coho salmon during stress.
Osmoregulation is the control of the levels of water and mineral salts in fluids of the body; it is a homeostatic mechanism.
29) However, AQP4 is most strongly expressed in the brain, and a major role in osmoregulation had been proposed.
The anthelminthic effect can be due to diminished cytoplasmic tubulin network, ATP production and protein synthesis, nercrosis, tegumental damage, altered permeability and osmoregulation.
A few plant responses to stress include: osmoregulation (Allard et al.