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!
Implantation - Pre-Embryonic Development
After entering the uterus and formation of ICM, the blastocyst starts to embed in the endometrium of the uterine wall. By one week after fertilization the trophoblast secretes enzymes which digest the tissues and blood vessels of the uterine wall. The invading trophoblast differentiates into two layers, the outer syncytiotrophoblast and the inner cellular layer. Like the syncytiotrophoblast swallows more blood vessels in the uterine wall lacunae develop in the syncytiotrophoblast that get filled up with blood from the mother and exchange of gases takes place here. So a primitive utero- placental circulation is established. This nourishes the embryo till the placenta is made. By the 10th day the blastocyst is totally embedded in the uterine wall.
This kind of implantation in which the embryo gets fully embedded is termed as interstitial implantation. The trophoblast begins to secrete human chorionic gonadotropin (HCG). HCG causes the corpus luteum to be maintained and to carry on to secrete estrogen and progesterone. Sometimes implantation may occur outside the uterus at some other location. In that case it is an ectopic pregnancy. The implantation site might be the fallopian tube or even the abdominal cavity. In ectopic pregnancy the embryo has to be surgically removed as if it is not done, it can lead to tuba1 rupture, internal bleeding, shock and possible death. At the beginning of the second week a small cavity appears between the trophoblast and ICM. This is the amniotic cavity that will grow around the embryo and later the foetus, It is a fluid filled cavity that act as an insulator against shocks, cold and heat. At similar time the ICM also differentiates into two layers, the upper epiblast which provides rise to the embryo and the lower hypoblast which gives rise to the extraembryonic membranes.
Quantitative Methods - Therapeutic diets Quantitative Methods: These are often essential for constructing Lherapeutic diets. The two ways by which this could be done are as
Many disease states are heralded by changes in the blood count Leukocytosis can be a sign of infection. Thrombocytopenia can result from drug toxicity. Pancytopenia is ge
Pituitary The pituitary is also known as hypophysis. It is composed of two embryologically distinct tissue. The anterior pituitary or adenohypophysis is derived from the roof
A plant grown from one of Mendel's yellow peas is selfed. Five progeny peas are obtained from this self and they are all yellow. If the original selfed plant had been homozygous, w
What is Calvin Cycle? The dark reactions of photosynthesis are also known as the Calvin cycle. This process synthesizes glucose molecules using carbon dioxide from the atmosphe
what are the physical requirements to become a zoologist?
What are Taxonomic characters Taxonomic characters Classification is done on the basis of information we have. More information gives better classification. Modern taxonomy
What are the dietitians services Dietitians are engaged in a variety of positions and in a number of work settings. Of course the largest proportion is involved engaged in
What surrounds a plant cell
give an example invertebrate phylum/phyla for protoplasmic grade organization
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