A blastocyst is about 2 weeks old. Implantation is important at this stage because the cells need an anchored place to divide the embryo develops sex characteristics using cells from the implant wall neural tube forms from the wall of the implantation cells need a means of receiving nutrition
A blastocyst is about 2 weeks old. Implantation is important at this stage because the cells need an anchored place to divide the embryo develops sex characteristics using cells from the implant wall neural tube forms from the wall of the implantation cells need a means of receiving nutrition
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Introduction:
- Early human embryos go through the blastocyst stage, which is characterised by a spherical structure made up of an inner cell mass surrounded by a layer of trophoblast cells.
- This stage occurs about 5 days after fertilisation and is when the embryo implants into the uterine wall to begin pregnancy.
- The trophoblast cells will develop into the placenta, and the inner cell mass will eventually differentiate into the embryonic disc, which will give rise to the foetus.
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