The intricacy of the artery, the high blood pressure system which carries blood away from the heart, of the human body is simplistically portrayed in the above diagram. The Internal and External elastic lamina are composed of elastin: a stretchy protein that will expand under increased luminal pressure but retract when that pressure is removed. The Adventitia layer is composed mostly of collagen which unfolds under the luminal pressure but refolds as the pressure decreases and the elastin causes the lumen diameter to decrease. The collagen limits the expansion of the lumen. The two proteins along with proteoglycans, which form a sort of lubricant, are the structural framework of arteries. They keep the blood pressure at an acceptable level (except in some disease states) so that the red blood cells and other components of the blood can flow through the body to bring necessary nutrients and oxygen to the cells of the body. As well veins care away waste products including CO2 to the lungs and kidneys. All the structures are needed simultaneously for the arteries (and veins) to function.
The complexity of these structures argues against a so-called incremental evolution and it does argue for a unique creation of all the structures at one moment in time.
(top pix from Wikipedia and bottom one from NIH)
The complexity of these structures argues against a so-called incremental evolution and it does argue for a unique creation of all the structures at one moment in time.
(top pix from Wikipedia and bottom one from NIH)
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