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The gametogenesis.El egg and sperm (gamete genesis is the k 1 process occurs in the gonads, in which form the gametes s) The ovulo.Ovogenesis formació n dl (the egg cell is 1 k is 1 diameter d 0, 1mm, a rounded, almost spherical and substances in their cytoplasm inmovil.Posee d reservation, the yolk, k will feed the embryo during the first days, up to k nested in the uterus, surrounding the outside d the plasma membrane structures are k protect the egg, are d inside out, the zona pellucida and corona radiata). espermatozoides.Espermatogenesis The formació nd (sperm cell is 1 pekeña elongated 5mm d d d diameter and contains the following parts, Head: contains 1 pekeña quantity d with nutrient reserves cytoplasm, the nucleus at its anterior end is 1 vesicle enzyme to penetrate the egg, called acrosoma.Cuello: No holds 1 large mitochondria k d d provide energy to the sperm, Tail: flagellum formed x 1 k provides mobility to reach the egg)The female sexual cycle (ovarian cycle: each cycle lasts 28 days, although its duration may vary d 1 woman to another, and has the function d maturation and release an egg. Cycle uterine cycle simultaneous ovarian, uterine cycle function is to prepare the uterus for possible nesting d 1 embryo)

Fertilization (the union dl dl sperm and egg to give rise to 1 single cell, the zygote, k, after successive divisions, give rise to 1 new human being, the encounter between male and female gametes occurs in the fallopian tubes, once there the sperm release enzymes contained in the acrosome, k act separating the corona radiata cells dl d egg and allowing the sperm interaction d cn the zona pellucida, one d they merged their membrane with that of the egg and male nucleus entered the cytoplasm este.simultaneamente d, dl egg membrane changes its structure, preventing the union d other sperm, the male nucleus carries 23 chromosomes, the nucleus cn s combined female carrier d other 23 chromosomes and originated 1 cn cell 46 chromosomes, the zygote)Embryonic development, gestation (d after fertilization, the zygote low x d tubes and the tube begins to divide x mitosis giving rise to the embryo, yolk k s dl feeds reaches implanted in the uterus ys endometrio.se form an organ, the placenta, k d can exchange substances between the mother and through d feto.A nutrients reaching the placenta to the fetus ys substances extracted desexo d, k x the fit will be expelled mother excretory d)

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