The chronic villi formed by the third month, when the chorion and the mesoderm increase its length to reach the core of each trophoblastic villus, results in the formation of the chronic villi. Chronic villi connected with the maternal tissue for the growth of fetus and allow maximum surface area for the active and passive exchange between the placenta and maternal bloodstream.

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Chapter 29, Problem 7RQ

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The chronic villi formed by the third month, when the chorion and the mesoderm increase its length to reach the core of each trophoblastic villus, results in the formation of the chronic villi. Chronic villi connected with the maternal tissue for the growth of fetus and allow maximum surface area for the active and passive exchange between the placenta and maternal bloodstream.

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