placenta - pion 368 slot
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The placenta is a temporary organ of pregnancy that allows metabolic exchange between mother and fetus. sarjanatoto It is composed of two surfaces, the fetal surface (or chorionic plate) and the maternal surface (or basal plate), and has two circulatory systems: fetal circulation and maternal circulation. virtual bingo cards The placenta also has functions such as fetal respiration, nutrition, excretion, protection, immunity and endocrine production