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The ''ahara'' which has undergone the complete digestion process only is able to provide nutrition to the body. (Cha.chi 15/5). Improperly formed ''ahara rasa'' (not having undergone the proper digestion process) cannot do the nourishment of ''dhatu''. (16)
 
The ''ahara'' which has undergone the complete digestion process only is able to provide nutrition to the body. (Cha.chi 15/5). Improperly formed ''ahara rasa'' (not having undergone the proper digestion process) cannot do the nourishment of ''dhatu''. (16)
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==== Fetal development ====
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==== Foetal development ====
    
According to contemporary science, it has been observed that after the formation of the zygote, the cells further divide and form into a ball of cells called blastocyst. Once this blastocyst reaches the uterus, it buries itself in the uterine wall. The blastocyst sticks tightly to the wall of the uterus and receives nourishment from the mother's blood. Further the embryonic cells multiply and start to take on specific functions. This is called differentiation. Blood cells, kidney cells, and nerve cells all develop. Simultaneously the brain, spinal cord, heart and gastrointestinal tract begin to develop. Further the arm, leg buds, cranial nerves, main vessels, lungs and other begin to develop. <ref> Cunningham FG, Leveno KJ, Bloom SL, et al. Fetal growth and development. In: Cunningham FG, Leveno KL, Bloom SL, et al, eds.Williams Obstetrics. </ref>  <ref> Ross MG, Ervin MG, Novak D. Placental and Fetal Physiology. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics: Normal and Problem Pregnancies. </ref>
 
According to contemporary science, it has been observed that after the formation of the zygote, the cells further divide and form into a ball of cells called blastocyst. Once this blastocyst reaches the uterus, it buries itself in the uterine wall. The blastocyst sticks tightly to the wall of the uterus and receives nourishment from the mother's blood. Further the embryonic cells multiply and start to take on specific functions. This is called differentiation. Blood cells, kidney cells, and nerve cells all develop. Simultaneously the brain, spinal cord, heart and gastrointestinal tract begin to develop. Further the arm, leg buds, cranial nerves, main vessels, lungs and other begin to develop. <ref> Cunningham FG, Leveno KJ, Bloom SL, et al. Fetal growth and development. In: Cunningham FG, Leveno KL, Bloom SL, et al, eds.Williams Obstetrics. </ref>  <ref> Ross MG, Ervin MG, Novak D. Placental and Fetal Physiology. In: Gabbe SG, Niebyl JR, Simpson JL, eds. Obstetrics: Normal and Problem Pregnancies. </ref>