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Vitellogenesis
Vitellogenesis is the stage where much of the oocyte growth occurs. The completion of second maturation division (meiosis), which may occur after ovulation, results in ripe egg or ovum. In some species such as sea urchins and frogs, the female produces hundreds or thousands of eggs at a time where as in most mammals including humans only a few eggs are produced in the entire lifetime of the individual. In this section we shall discuss oogenesis in two groups of animals,
(1) The amphibians as an example of organisms which produce yolky eggs and
(2) Mammals, as an example of organisms whose eggs do not contain any yolk.
Optic vesicle We have explained earlier that the presumptive material for the optic vesicles lies in qe eye field in the anterior region of the early neural plate. Experiments
What are the Pupillary defects There are certain deviations from normal pupillary reflexes which point towards certain specific pathology.
Where are blood cells made in the body? Blood cells are made in the red bone marrow, e.g. in the ribs, sternum or vertebrae.
The destruction of the ozone layer may be responsible for an increase in
In the axon of a nerve cell, A. the voltage-dependent conductance of the voltage-gated potassium channel has a faster time course than the voltage-dependent conductance of the
what is feeding mechanism
What is Allantois One of the extraembryonic eggs found in the amniote animals. The allantois contains the metabolic wastes created by the developing embryo. May also be involved
ATP-sensitive potassium channel? A. In smooth muscle cells surrounding an arteriole serving a region of the body that has just recently had very high levels of cellular acti
Assume you are injecting a sub threshold depolarizing current step into a neuron. Draw the corresponding membrane voltage response; be sure to indicate the shape of the voltage cha
Attempted Suicide: Suicide and homicide represent major source of morbidity and mortality in psychiatric practice. Suicide means killing of oneself. An attempted suicide is
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