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Encyclopedia > Pore

A pore, in general, is some form of opening, usually very small. Pores can be found on many organisms, such as in plants, animals, and humans.


More commonly, in talking about the skin, a pore is an opening into a sebaceous gland that secretes oil to lubricate and protect the surface of the skin. A section of Human Skin In zootomy and dermatology, skin is an organ of the integumentary system made up of a layer of tissues that guard underlying muscles and organs. ... The sebaceous glands are glands found in the skin of mammals. ... Natural olive oil Synthetic motor oil Oil, in a general sense, is a chemical compound that is not miscible with water, and is in a liquid state at ambient temperatures. ...


Enlarged pores can be a cosmetic problem, especially during puberty, where pores, especially around the forehead and nose (the "T-zone") enlarge in order to cope with increased oil output. Often, after puberty ends, and the oil glands approach a regular output, the pores may consequently decrease in size too. Puberty refers to the process of physical changes by which a childs body becomes an adult body capable of reproduction. ...


In plants, pores exist in leaves in order to aid in photosynthesis and respiration. In these cases, the pores are known as stoma. Many organic substances are porous (containing many pores), and they can be very light. Such substances include wood and the bones of some birds, whose porous structure enables these substances to be very light, but strong. The leaf is the primary site of photosynthesis in plants. ... Cellular respiration is the process in which the chemical bonds of energy-rich molecules such as glucose are converted into energy usable for life processes. ... SEM photo of stomata, 350x, colorized In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the undersurface of a plant leaf, and used for gas exchange. ... A tree trunk as found at the Veluwe, The Netherlands Wood derives from woody plants, notably trees but also shrubs. ...


Cells often contain pores called aquaporins in order to facilitate the movement of water in and out of cells by means of osmosis. Ion channels contain pores to allow ions to pass through the cell's plasma membrane into or out of the cell. Cells in culture, stained for keratin (red) and DNA (green). ... Sideview of Aquaporin 1 (AQP1) Channel Aquaporins are a class of integral membrane proteins that form pores in the membrane of biological cells and selectively conduct water molecules in and out, while preventing the passage of ions and other solutes. ... Osmosis is the diffusion of a liquid (most often assumed to be water, but it can be any liquid solvent) through a partially-permeable membrane from a region of low solvent potential to a region of high solvent potential. ... Another, unrelated ion channeling process is part of ion implantation. ... // An ion is an atom or a group of atoms (a chemical substance), or subatomic particle, with a net electric charge. ... Drawing of a cell membrane A component of every biological cell, the cell membrane (or plasma membrane) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ...


In geology, pores refer to the open space within a rock. Just as a stack of oranges in the grocery store have spaces between them, so too do rocks. Pores in rock are where groundwater, oil, and natural gas are found. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history and the processes that shape it. ... Sedimentary, volcanic, plutonic, metamorphic rock types of North America. ... Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. ... Pumpjack pumping an oil well near Sarnia, Ontario Petroleum (from Greek petra – rock and elaion – oil or Latin oleum – oil ) or crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish liquid. ... Many stoves use natural gas. ...


Pores can also be referred to as the space between molecules. For example, when salt dissolves in water, it goes in the pores of the water.


The holes in a sponge.


See also


  Results from FactBites:
 
Pore - Rock & Pop band from Helsinki, Finland (63 words)
Pore - Rock and Pop band from Helsinki, Finland
Pore was a rock band from Helsinki, Finland.
The band was together from 1994 to 2007.
Pore - Wikipedia, the free encyclopedia (274 words)
Enlarged pores can be a cosmetic problem, especially during puberty, where pores, especially around the nose (the "T-zone") enlarge in order to cope with increased oil output.
Pores in rock are where groundwater, oil, and natural gas are found.
Pores can also be referred to as the space between molecules, such as when salt dissolves in water, it goes in the pores of the water.
  More results at FactBites »

 
 

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