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What is Breathing?

Q. What is breathing? Ans. Breathing is an external process, in this process inhale of air and exhale of air. Or  Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.   Breathing is also known as external respiration. It is part of respiration but not internal or cellular respiration. The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and whose gaseous composition differs markedly from that of the ambient air . Physiological respiration involves the mechanisms that ensure that the composition of the fu
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Asexual Reproduction by Regeneration


 Regeneration (Re=again, Generate=grow)

o   Regeneration is asexual reproduction is the ability of a simple organism to re-grow its lost parts.
o   Simple organisms are more successful with regeneration than complex organisms.
E.g. Some crabs can grow new claws or body parts after the original parts are lost.
o   Every species is capable of regeneration from bacteria to humans.











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