Kinesiology 3222A/B Final: Human Development

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Deine pregnancy and the period of human development. Describe implantation and pre- embryonic development identify the three primary germ layers derived from the process of gastrulation. Diferentiate the various organ systems produced by the primary germ layers during embryogenesis terms: Pregnancy: events from time of fertilization (conception) until infant is born. Gestation period: period of development: from last menstrual period until birth, typically 280 days egg to embryo: fertilization sperm must reach ovulated secondary oocyte. Ovum viable for 12-24 hours sperm capable of fertilizing egg for 24-72 hours sperm transport. Millions leak from the vagina after intercourse. Hundreds thousands reach the uterine tubes. Must undergo capacitation and acrosomal reaction capacitation. Confers ability to swim rapidly and to fertilize egg. Weakening of acrosomal membrane on sperm due to secretions by the female reproductive tract: necessary for appropriate release of enzymes acrosomal reaction. Binds zona pellucida release acrosomal enzymes: hyaluronidase, acrosin, proteases completing meiosis sperm loses tail and midpiece.