A
Aloysium
Guest
Giraffes are very interesting. When compared to other mammals, along with the differences they exhibit in their musculoskeletal structure, which includes very long cervical vertebrae, there are accommodations in their respiratory, cardiovascular and nervous systems that are necessary to meet the challenges of having long necks. If we were to breathe through a 2 meter long tube, it would not take long to asphyxiate, since we’d be breathing the same air over and over. This issue is overcome in the giraffe’s having a lung capacity about eight times larger. In terms of blood flow, to provide sufficient perfusion to the brain at normal pressures, the arterial pressure at the giraffe’s 30 cm long heart is about twice that in humans. Their arteries, capillaries and veins are structured in different ways to adjust for when they lower their heads, to withstand the pressures that would in other mammals damage the kidneys and prevent the edema that gravity would produce otherwise. The design of their gastrointestinal system includes a very powerful esophageal musculature to permit rumination. If we are thinking about alterations in a pre-existing genetic code, passed on to offspring, consideration must be given as to how such changes would occur at the various parts of the genome in order to result in the many alterations that would have to occur, pretty much simulatneously in order for the resulting creature to survive. Creationism is the best explanation even at a purely physical level." Need a Longer Neck Mr. & Mrs. Giraffe? No Problem!
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