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.
advantages and disadvantages of protozoa
Explain Gluten-free diet Gluten-free diet : It is a diet recommended for the patients with gluten enteropathy. Gluten is present in wheat, rye, barley and oats. Thus, foods co
Ringworm in humans is caused by : 1. Bacteria 2. Fungi 3. Nematodes 4. Viruses Fungi
Explain about the Protein-Energy Ratio (NDP Cal%)? Platt and his colleagues (1961) are largely responsible for the introduction of the ratio of protein energy to total energy (
What is the structure of the adult fern within which cells undergoing meiosis can be found? In these plants meiosis takes place within structures known as sorus (plural, sori),
Kreb's cycle is the biochemical cycle in the cellular aerobic metabolism where the acetyl CoA is combined with the oxaloacetate to form citric acid; the resulting citric acid is c
Q. Show the Chemical indicators used in sterilization cycle? Chemical indicators indicate the presence of certain conditions during the sterilization cycle, such as the presenc
A 21-year-old woman presents with a 3-month history of malaise, joint pain, weight loss, and sporadic fever. Her temperature is 38°C (101°F). The serum antinuclear antibody (ANA) t
Behavioural Counseling This evolved froni tlie early theories of behaviourism. The focus is on examining current behaviours and learning new ones. It is believed that feeli
Nursing Management The overall goals are that patient with RH fever will resume daily activities without Joint pain, reduce the risk of residual cardiac disease, and plan a
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