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Carries oxygenated blood and nutrients from the placenta to the fetus and oxygenated and waste out.

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The allantois, amnion, chorion and yolk sac

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Foundation of umbilical cord, after 2 months it degenerates and becomes part of the urinary bladder

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Small sac attached to fetus that helps in digestion, and blood/ gamete cell production

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organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.

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After differenation, distinct human structures such as organs become present from 3 weeks +

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The trophoblast of the blastocyst secretes enzymes to digest tissue and blood in the endometrium of the uterus to sink and attach attach to the uterine lining during this process.

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Totipotent cells- one of the most important stem cells types because they have the potential to develop into any cell found in the human body. A good example is the zygote.
Pluripotent- Similar to Totipotent but dont differentiate into cells that surround the embryo
Multipotent- Cells with special function ex bone marrow

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process where a cell changes from one cell type to another. Usually, the cell changes to a more specialized type.

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment.

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The biological process that causes an organism to develop its shape.

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Developing embryo after germ layers are formed

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Process of forming the three germ layers

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Gastrulation   Formation of Germ Layers   YouTube

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Primary germ layers of early embryo.
Ectoderm- Outmost layer
Mesoderm- Middle
Endoderm- Inside layer

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membrane that covers the embryo when formed. Filled with the amniotic fluid which causes the amnion to expand and become the amniotic sac.

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secreted by trophoblast during implantation.. It functions the same as LH to maintain the corpus luteum in the ovaries to continue estrogen and progesterone production while preventing menstruation. The presence of hCG in a woman's urine is what gives a positive pregnancy test.

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forms within the blastocyst, eventually the embryo.

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Outermost membrane of blastocyst (Trophoblast) and surrounds embryo, allantois is explained later.

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After zygote is formed it undergoes rapid cell division to form the blastula which will form the blastocyst. The rapid, many rounds of cell division are called cleavage. When the zygote has split into 16 cells its now the Morula. When zygote is finished dividing, Blastocyst forms in preparation for implantation.

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when a sperm and an oocyte (egg) combine. Both haploid cells containing half of the needed information to make a new human being, their combo forms a diploid cell. This new cell, called a zygote, has all the material needed to form a human—half from the mother and half from the father.

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A short scientific animation of the journey of the sperm cell when fertilizing the egg. The backgrounds/environments were modelled & textured in Zbrush. The sperm cells were animated in Modo, using dynamic curves, replicators and particles. The rendered output was composited in Fusion 7 and Hitfilm 3 Pro.