which animal heart is found in his head ?
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ANSWER. ...
Even a zoologist like myself can be puzzled at times by claims some people make. Said a colleague of mine to me the other day for instance: “Why don’t you write about the heart in the head of the giraffe some day?”
Well, as far as I knew the place of the heart of the giraffe was in its chest. That is where I would go looking for it, and indeed, that’s where it is. But my colleague’s suggestion did uncover something exciting. Unlike other mammals, only in the head of the giraffe just below the brain lies a complex tissue of distensible arteries (the so-called “rete”), which could help pumping up blood 3 to 4 metres high into the head, where of course the giraffe’s brain would need nutrients and oxygen delivered to it by the blood. Although some scientists favour a role as a temperature regulator for the organ in question, one wonders of course, why such a structure should occur in so well-developed a condition only in the giraffe and not any other savannah loving animal.
Also, it is an established fact that arteries by themselves (and not just the heart) undergo regular contractions to propel the blood in them forward. Flaps, similar to but much smaller than those inside the heart metres away in the chest are present in the arteries and prevent the blood from obeying gravity and flowing back. It probably goes too far to call the structure in question a “heart in the head”, but functionally it certainly assists and performs actions akin to those that occur in the proper heart in the giraffe’s chest, which without the rete’s assistance would have to be extraordinarily powerful to pump blood 3 or even 4m high against gravity.
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