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!
Cleavage and Blastocyst
Even though the cleavage is complete and all the blastomeres are of more or less equivalent size. Synchronization of mitoses in the blastomeres is lost very early. Even the first two blastomeres may cleave at dissimilar rates; consequently, a 3 cell stage and subsequently stages of five, six, seven blastomeres and so forth are found. The result of the cleavage is a solid mass of cells a morula, where some cells are superficial and others lie inside, completely cut off from the surface through them enveloping cells.
In due course the superficial cells join to make a distinct epithelial layer. This layer provides rise to most of the extra embryonic parts (the embryonic membranes), serves to attach the embryo to the uterine wall, and mediates in the supply of nourishment to the embryo from the maternal body via the placenta. This outer layer of the mammalian embryo is termed as the trophoblast (the term trophe meaning nourishment). The cells lying in the interior are known as the inner cell mass (ICM), and it is these cells that provide material for the formation of the embryo proper. Hence they may, be referred to as the formative cells. Sooner or later a cavity appears inside the compact mass of cells of the morula. The cavity is formed of crevice that appears among the inner cell mass and the cells of the trophoblast. Fluid is imbided into this cavity, so that it enlarges. The trophoblast becomes lifted off most of the inner cell mass remaining attached to it on one side only. This side corresponds late to the dorsal side of the embryo. A mammalian embryo at this stage is termed as a blastocyst.
Define Brain Stem Brain stem consists of three parts i.e. midbrain, pons and medulla oblongata. The functions of the Brain Stem are: Brain stem contains points of cranial
Q. What is tertiary structure of a protein? What are the major types of tertiary structure? The tertiary protein structure is a spatial conformation additional to the secondary
Figure shows part of a DNA molecule (a) (i) What do the dotted lines in Figure represent? (ii) Name J to M. J.............................. K..............................
What are the chemical substances that compose the plasma membrane? Ans) The major constituents of the plasma membrane are phospholipids, proteins and carbohydrates. The phosphol
Q How does the excretory system of nematodes work? The metabolic residuals of nematodes are together by two longitudinal lateral excretory channels that open in one single excr
M protein of rheumatogenic GAS has distinct structural characteristics that are akin to human heart tissue, particularly sarcolemmal membrane proteins and cardiac myosin. The major
State the term in detail hydrostatic skeleton. Formed from a fluid-filled and closed cavity surrounded by a body wall comprising muscles oriented in different directions. Muscu
Medical Management In chronic renal failure there is irreversible renal failure. The goals of medical management are: To promote maximal renal function To ma
What are Proteins and Why they are important for us? We just read that proteins are essential for maintaining and sustaining life. What are proteins or what constitutes protein
Q. How do cells of neoplastic tumors obtain oxygen and nutrients and release wastes? In the neoplastic tumors a phenomenon called as angiogenesis occurs. The Angiogenesis is th
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd