Why Do Some Organs Come In Pairs

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We all have two of certain organs, like kidneys and lungs, but why not multiple hearts, livers or brains? • • Read More: • Bilaterial Symmetry • http://www.nhm.ac.uk/nature-online/ev... • “Humans have body plans that are bilaterally symmetrical. This means that if you draw a line down the centre of the human body, from the middle of the head to the feet, the same features appear on either side.” • • Why do you have two lungs but only one heart? • http://health.howstuffworks.com/human... • “Your vital organs -- like your lungs, your heart, your pancreas, brain and liver -- are just that, vital. Not only are they vital to life, they are also vital to one another.” • Why have one heart but two kidneys? • http://www.thenakedscientists.com/HTM... • “It’s not just us that are bilaterally symmetrical. All vertebrates are – be they birds, reptiles, frogs, or fish. In fact, not just vertebrates but almost all other animals are bilaterally symmetrical as well.” • ____________________ • • DNews is dedicated to satisfying your curiosity and to bringing you mind-bending stories perspectives you won't find anywhere else! New videos twice daily. • • Watch More DNews on TestTube http://testtube.com/dnews • • Subscribe now! http://www.youtube.com/subscription_c... • • DNews on Twitter / dnews • • Trace Dominguez on Twitter / tracedominguez • • Julia Wilde on Twitter / julia_sci • • DNews on Facebook / discoverynews • • DNews on Google+ http://gplus.to/dnews • • Discovery News http://discoverynews.com • • Download the TestTube App: http://testu.be/1ndmmMq

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