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A pure phospholipid bilayer with its hydrophobic interior, is permeable to water and gases such as O2, CO2, N2 and small uncharged polar molecules such as urea, ethanol, but is impermeable to large uncharged polar molecules such as glucose, ions (Na+ , K+ , Cl-, Ca2+ ) and charged polar molecules instance for amino acids, ATP, glucose 6-phosphate. The initial group of molecules can cross a biological membrane unaided and without an input of energy, whereas the latter group requires the presence of integral membrane transport proteins and, in many cases an input of energy to travel by the otherwise impermeable membrane barrier. Thus the plasma membrane and the membranes of internal organelles are selectively permeable barriers and maintaining a distinct internal environment.
PHYSIOLOG Y OF DIGESTION Food - omnivorous. Digestion - Intercellular. (i) Mechanical - by chewing, deglutinationm, churnning, peristalais. Under control of medulla oblonge
Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo
What are cytokinins? Where are they made? Cytokinins are phytohormones active in the promotion of cellular division; they slow down the aging of tissues and act together with a
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How does parafunctional habits lead to implant failure Parafunctional habits like bruxism and clenching create mechanical and biological problems due to overloading and is cons
Explain the term- PUPIL Pupil is the aperture in centre of the iris diaphragm that regulates entry of light into the eye. Colour of pupil is said to be black. Actu
Explain Transport and Utilization of Vitamin A? The efficacy of the intestines to facilitate absorption and utilization of retinoid s and carotenoids depends upon the cellular
What do you understand by Pseudocoelomate? Animals that have a body cavity which is not completely lined by mesoderm. In past these organisms were referred to as the phylum Asc
What are the lowest and highest temperatures humans can survive? Being in cold temperature air with proper shelter and clothing, humans can endure indefinitely, even if the tem
P A TTERNS OF CLEAVAGE - Patterns of cleavage depends upon amount of yolk & distribution of yolk. These are following types - 1 . RADIAL CLEAVAGE PATTERN -
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