Lower animals have sought their own means of supplying the heart with blood. Nature proved to be thousands of millions of years ahead of Napoleon when he said that the way to a soldier’s heart is through his stomach. In creating lamellibranch (bivalve) mollusks nature decided to pierce their heart through.

However, it did not use Cupid’s arrow for the purpose but merely the end-gut. No one knows why an intestine should go through the heart ventricles of a mollusk. This is, no doubt, the simplest way to supply the blood with nutrients, and perhaps the supply of nutrients to the cardiac muscle itself is most improved.

The main function of the cardiovascular system is to transport all the necessary materials to all parts of the body. Some substances move in the blood by themselves, but others, mainly gases, travel on the back of the red blood corpuscles (erythrocytes). Every cubic millimetre of blood contains 4.5-5 million carriers, making a total of 35000000000000, the world’s largest caravan.

The size of the erythrocytes is negligible, only eight microns each, but if arranged in a chain, like camels in a caravan, they would encircle the Earth seven times around the equator. The red corpuscles of a whale, the largest living creature on the Earth, would form several caravans and each would stretch as far as the Sun.

April 21, 2010 at 12:04 pm by admin
Category: Action of Heart
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