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!
Primary Egg Envelopes
These are the egg envelopes which develop in the ovary between oocyte and follicle cells in the space occupied by the interdigitating microvilli. Such envelopes have been named variously in different animals.
a) It is named as vitelline envelope or vitelline membrane in insects, molluscs, amphibians and birds.
b) In tunicates and fishes, it is known as chorion. In many sharks and bony fishes the primary envelope has striated appearance and is referred to as zona radiata representing the degraded microvilli of the growing oocyte. The perforation in the zona radiata becomes the micropyle through which the spermatozoa can enter the egg.
c) In mammals, the unstriated and modified zona pellucida is formed as a result of joint efforts of egg and follicle cells. While escaping the Graafian follicle mammalian oocyte carries on the surface of zona pellucida a layer of follicle cells known as corona radiata. The primary envelopes usually stick closely to the egg surface. These later on participate in the formation of fertilization membrane.
Q. What is Lipid-lowering Trial? Aggressive lipid-lowering drug treatment of persons at various risk levels reduces Coronary Artery Disease morbidity and mortality rates and in
Define Historical example of Ecosystems Science? Mathematical and statistical tools are central to enhancing our understanding of large-scale systems and contain, for instance,
What is Dyslipidaemia ? The results of epidemiological studies, as well as trials with angiographic or clinical endpoints, confirm the importance of various lipid fractions in
Define absorption, transport and excretion of magnesium? Magnesium absorption to some extent is similar to that of Ca. Absorption of Mg occurs throughout the small intestine, a
Pathophysiology Large haemorrhages and fibrinous lesions vegetate along the inflaked edges of valves. The lesions develop on adjacent valve leaflets so that the edges adh
Q. What do you mean by Herbaria and Museums? A herbarium is a collection of pressed and dried plants arranged according to some valid system of classification and available for
Question 1: What are Good Pharmacovigilance Process and Good Post-Marketing Surveillance Process? How do they differ from each other? Define and illustrate briefly Good Post
How to monitor body weight to enhance athletic performance? Monitoring body weight is a practical way to assess energy balance. Weight stability, particularly during periods
Why isn't the cooking of vitamin C-containing foods appropriate for vitamin C supply? To obtain vitamin C, for example, from an orange dessert, the vitamin-containing food cann
How to Promote Physical Activity to combat from Obesity? For many children, low physical activity rather than excessive energy intake is the primary culprit. Management of obes
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