alevels2k17
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#1
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Are embryonic stem cells cells of the placenta or body cells or inner embryo? and what are extraembryonic stem cells
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Lighfy
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(Original post by pondsteps)
Are embryonic stem cells cells of the placenta or body cells or inner embryo? and what are extraembryonic stem cells
Pleuripotent stem cells are located in the aortic-gonad mesonephros region of the embryo and give rise to the different tissue types and placenta. Cells such as haematopoietic stem cells eventually migrate from the embryo to places such as the bone marrow in adult humans.
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alkyone
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I don't know if you know what a blastocyst is? Basically after you form a zygote, it starts dividing, and it forms a structure that is basically a ball of cells surrounding a cavity, but at a certain point there is a group of cells together, called the inner cell mass. Embryonic stem cells are cells from that inner cell mass, and they can give rise to all the structures you need to make an embryo/ baby. A small part of it participates in making the placenta as well.
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alevels2k17
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(Original post by alkyone)
I don't know if you know what a blastocyst is? Basically after you form a zygote, it starts dividing, and it forms a structure that is basically a ball of cells surrounding a cavity, but at a certain point there is a group of cells together, called the inner cell mass. Embryonic stem cells are cells from that inner cell mass, and they can give rise to all the structures you need to make an embryo/ baby. A small part of it participates in making the placenta as well.
aha thanks .. so what are extraembryonic stem cells??
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alkyone
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They are the cells that make up the lining of the blastocyst and they give rise to membranes like the largest part of the placenta, the amnion that surrounds the embryo and something called the yolk sac that provides nutrition for the baby before the placenta becomes functional.
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alevels2k17
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(Original post by alkyone)
They are the cells that make up the lining of the blastocyst and they give rise to membranes like the largest part of the placenta, the amnion that surrounds the embryo and something called the yolk sac that provides nutrition for the baby before the placenta becomes functional.
yeah so only totipotent cells give rise to extraembryonic stem cells and pluripotent and totipotent both give rise to emryonic right?
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GcseMaths
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Hallo. Grob gesagt, müssen Sie 99% auf die Prüfung ein A * zu erhalten. Doch für eine C-Klasse benötigen Sie nur etwa 49 %, was ganz einfach ist, für AQA Deutsch zu erhalten.
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alkyone
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(Original post by pondsteps)
yeah so only totipotent cells give rise to extraembryonic stem cells and pluripotent and totipotent both give rise to emryonic right?
Basically the only true totipotent cells are the ones after fertilisation, before the blastocyst stage. After that the inner cell mass cells and lining cells are considered pluripotent, as inner cell mass cells cannot give rise to any membranes, and lining cells cannot become embryo structures.
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