Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Extra-Embryonic Membranes and Placenta
The extra embryonic membranes like you already know provide nourishment and protection. These membranes are fundamentally similar to the extra-embryonic membranes of reptiles and birds, however the method of origin differs in humans. During the third and fourth week, the amnion grows around the embryo enclosing it in a membranous fluid filled sac in which the growing embryo and later the foetus floats and can move freely. This sac as mentioned in the previous section is a shock absorber and encloses a fluid, the amniotic fluid, that helps to keep the temperature of foetal environment stable. Another membrane, the chorion develops from the trophoblast cells. The chorion is a extremely specialised extraembryonic tissue. It facilitates the transfer of gases, nutrients and wastes among the embryo and the mother. It is the primary part of the placenta that we will study a little later. Yolk sac develops during the second week of development even though there is no yolk in the human egg. It does not give nourishment to the embryo but it becomes surrounded by mesoderm that forms the blood cells till the liver of the embryo becomes functional in the sixth week. The yolk sac with the allantois forms the umbilical cord. Part of the yolk sac also forms the lining of the gut. The allantois that forms during the third week of development is a tiny sausage shaped pouch on the yolk sac. It also is accountable for producing blood cells and later develops into the umbilical blood vessels.
Q. In general what is the phase of the menstrual cycle when copulation may lead to fecundation? Although this is not a rule, to be effective fecundation in general must occur w
What is the function of keratin in the epidermis? The epidermis is the outer layer of the skin made of epithelial tissue. In the epidermis there are keratin-secreting cells (ke
Into which classes are mollusc divided? What are some representing beings of each class? The phylum Mollusca is separated into five major classes: pelecypods, or bivalves (Pele
Systolic heart failure is a classic heart failure where the inotropic (contractile) state is impaired and the expulsion of blood is not adequate. So the main manifestations of syst
Body Musculature - Locomotion The layout of the muscle layers surrounding the coelom is necessarily the same in all the major classes of Annelida. The body wall has a layer of
How is genetic engineering used to create bacteria capable of producing human insulin? In a production of human insulin by bacteria the human insulin gene is incorporated into
Explain the Principle or Theory of biuret method? If a strongly alkaline solution of Biuret is heated with very dilute copper sulphate, a violet colour is obtained. The substan
Define the Wealth Care Delivery ? The challenge that exists today in many countries is to reach the whole population with adequate health case services and to ensure their util
Q. Explain the nucleolus? The nucleolus is an optically and a small dense region in the interior of the cell nucleus. It is made of ribosomic proteins and RNA (rRNA). One nucle
Which of the below terms is used to explain the study of factors which influence flow characteristics of blood as it moves through the body? Is it: a) Anginology b) Hemodyna
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd