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most important of the sequence of events that gradually change a zygote into a functional organism are |
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Growth-Increase in cell number & Differentiation-hman cells specialize into more then 200 different types of cells will specific structures and functions |
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| First series of mitotic divisions in which overall original size of the zygote doesnt change, but the number of cells in the zygote increases. |
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| Hollowball of cells that is formed at the end of cleavage |
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When the cells in the blastual start to move and create a 3 layer structure call the embryonic germ layers |
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| The 3 embryonic germ layers are the... |
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| Ectoderm, the endoderm, and the mesoderm |
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| epidermis and nervous system |
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| liver, pancreas, digestive system, and respiratory system |
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| muscle, bones, circulatory system, excretory system, sex organs, etc. |
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| From fertilization to 8 weeks the baby is called a(n) |
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| After 8 weeks the baby is called a(n) |
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allows the the exchange of nutrients, waste, and oxygen from the mother to the baby. it also provides hormones to prevent menstruation and ovulation |
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| the outermost embryonic membrane, that surrounds the embryo and other membranes |
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Embryonic in origin-it, combined with the uterin lining, form the placenta AKA Chorionic Villi+ Uterine lining=placenta |
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| the innermost membrane-it surrounds the fetus within the chorion-it is filled with amniotic fluid-gives fetus stable environment-shock absorber |
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period of time from implantation to birth in humans it takes appr. 9 months |
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The expulsion(release) of the baby from the uterus(womb) ****influenced by hormones**** |
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Uterine contractions open cervix and push baby out *the cervix must incream from 2 cm to 12 cm for baby to exit vagina |
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-Baby exits birth canal, still attached to umbilical cord and placenta -umbilicle cord is cut(eventually dries, falls off, leave scar called naval) |
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| the expulsion of the placenta and amnion |
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