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RBC

Red blood cells are the most common type of blood cell and the vertebrate body's principal means of delivering oxygen to the body tissues via the blood. They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries. The cells are filled with hemoglobin, a biomolecule that can bind to oxygen. The blood's red color is due to the color of oxygen-rich hemoglobin. In humans, red blood cells develop in the bone marrow and live for about 120 days; they take the form of flexible biconcave disks that lack a cell nucleus and organelles and they cannot synthesize protein.


  1. animatious saidMon, 15 Jun 2009 16:44:51 -0000 ( Link )

    Correct use of font:-

    Computer fonts assigns symbol the way they are coded. It determines whether or not you will be able to use it on a particular project, it also determines if you will be able to expand or enlarge it in order to produce bigger images without distortion.

    Generally Serif fonts are used for printed materials like books, newspapers, magazines, etc. To write and design banners and billboard we should use fonts which are readable such as Arial and Helvetica. When documents are of a serious nature Arial and Helvetica fonts are the way to go, however we not always want things to be completely readable, that’s why some fonts can be used in order to hide secret messages, these change regular letters into symbols which can be changed back to the original message by someone holding the same font patterns as the person who wrote it. But when people were surveyed on whether Times New Roman (the default font for many browsers and word processors) or Arial font (a common Sans Serif font) was easier to read on a computer screen, the results were approximately 2:1 that Arial was much more readable.

    Another survey was done that compared Verdana and Arial, two different Sans Serif fonts. Some interesting results were found that showed that at 12 pt. font, Arial was easier to read. However, when the size of the font was decreased two points, Verdana was found to be much easier to read; when font size decreased one more point, the gap widened between those who thought Verdana was easier to read and those who favored Arial. At a 9 pt. font, Verdana was chosen as more easily read by 74% of the people surveyed.

    This means that in this survey if you use 12pt or larger font online you should use Arial. If you use 10pt or smaller, you should use Verdana. Looks like I might need to go back and examine my stylesheets.

    Web designers may use a wide assortment of these fonts since every project is different, sports, news, social sites, video sites, science sites are all different and all require different font types which need to be rendered properly on the end user’s monitor, these styles are also part of what is known in web page design as CSS or cascade style sheets.

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  2. maniarnr saidTue, 22 Sep 2009 10:31:44 -0000 ( Link )

    A nice lesson but it would have been better if it were longer inclding more information

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