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the essence of life
the essence of life

... The importance of surface area:volume ratio • Let amount of metabolism that occurs within a cell be a function of cell volume • Let rate of metabolism (which is a function of supply of reactants, and removal of products) be a function of surface area • Therefore,surface area:volume ratio (SA:Vol) d ...
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... • Involuntary:  not under conscious control.  Impulses originate from the brain stem (medulla) • Contracts in a rhythmic manner ­ sets up wave­like contractions (peristalsis) which are stronger and of longer  duration (labor) • Microscopic appearance:  single spindle­like cells, no striations, singl ...
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Cell culture



Cell culture is the process by which cells are grown under controlled conditions, generally outside of their natural environment. In practice, the term ""cell culture"" now refers to the culturing of cells derived from multicellular eukaryotes, especially animal cells, in contrast with other types of culture that also grow cells, such as plant tissue culture, fungal culture, and microbiological culture (of microbes). The historical development and methods of cell culture are closely interrelated to those of tissue culture and organ culture. Viral culture is also related, with cells as hosts for the viruses. The laboratory technique of maintaining live cell lines (a population of cells descended from a single cell and containing the same genetic makeup) separated from their original tissue source became more robust in the middle 20th century.
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