"Verily, in cattle there is a lesson for yon. I give you drink from their insides, coming from a conjunction between the digested contents ( of the intestines ) and the blood, milk pure and pleasant for those who drink it." Qur'an, 16:66

                                                                                                   

Physiology In the field of physiology, there is one verse which appears extremely significant to me. One thousand years before the discovery of the blood circulatory system, and roughly thirteen centuries before it was determined that the internal organs were nourished by the process of digestive , a verse in the Qur'an described the source of the constituents of milk, in conformity with scientific facts. To understand this verse, it must first be known that chemical reactions occur between food and enzymes in the mouth, the stomach and the intestines releasing nutrients in molecular form which are then absorbed into the circulatory system through countless microscopic projections of the intestinal wall called villi. Blood in the circulatory system then transports the nutrients to all the organs of the body, among which are the milk-producing mammary glands. This biological process must be basically understood, if we are to understand a verse in the Qur'an which has for many centuries given rise to commentaries that were totally incomprehensible. Today it is not difficult to see why! This verse is taken from the chapter an-Nahl: "Verily, in cattle there is a lesson for yon. I give you drink from their insides, coming from a conjunction between the digested contents ( of the intestines ) and the blood, milk pure and pleasant for those who drink it." Qur'an, 16:66 The constituents of milk are secreted by the mammary glands which are nourished by the product of food digestion brought to them by the bloodstream. The initial event which sets the whole process in motion is the conjunction of the contents of the intestine and blood at the level of the intestinal wall itself. This very precise concept is the result of the discoveries made in the chemistry and physiology of the digestive system over one thousand years after the time of Prophet Muhammad (S).     *  The Quran and Modern Science: by Dr. Maurice Bucaille (Edited by Dr. A. A. Bilal Philips)-http://www.whyislam.org

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