secondary oocyte
Słownik biologicznysecondary oocyte rzeczownik
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Thus, the time as a secondary oocyte is measured in days.
When meiosis I is completed, one secondary oocyte and one polar body is created.
The secondary oocyte is the cell that is formed by meiosis I in oogenesis.
As a result of meiosis I, the primary oocyte has now developed into the secondary oocyte and the first polar body.
The secondary oocyte is the largest cell in the body, and in humans is just visible to the naked eye.
The secondary oocyte promptly matures into an ootid and then becomes a mature ovum.
The primary oocyte turns into a secondary oocyte in mature ovarian follicles.
During ovulation, the arrested secondary oocyte leaves the ovary and matures rapidly into an egg ready for fertilization.
Immediately after meiosis I, the haploid secondary oocyte initiates meiosis II.
The secondary oocyte continues the second stage of meiosis (meiosis II), and the daughter cells are one ootid and one polar body.
In human embryogenesis, the theca cells form a corpus luteum after a Graafian follicle has expelled its secondary oocyte arrested in second meiosis.
This remaining follicle, the late tertiary or pre-ovulatory follicle, ruptures and discharges the oocyte (that has since grown into a secondary oocyte), ending folliculogenesis.
The secondary oocyte undergoes meiotic division II and that results in the formation of a second small polar body and a large mature egg, both being haploid cells.
By this time, the oocyte has completed meiosis I, yielding two cells: the larger secondary oocyte that contains all of the cytoplasmic material and a smaller, inactive first polar body.
The release of LH matures the egg and weakens the wall of the follicle in the ovary, causing the fully developed follicle to release its secondary oocyte.
Cortical granules inside the secondary oocyte fuse with the plasma membrane of the cell, causing enzymes inside these granules to be expelled by exocytosis to the zona pellucida.
An important event in the development of the tertiary follicle occurs when the primary oocyte completes the first meiotic division, resulting in the formation of a polar body and a secondary oocyte.
A cell called the secondary oocyte, which contains half the female chromosomes and normally becomes the egg, fused with another cell called the secondary polar body, which contains the identical genetic material.
The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or estrous cycle, following the release of a secondary oocyte from the follicle during ovulation.
It occurs at sexual maturity when hormones stimulate the oocyte to complete meiotic division I. The meiotic division I produces 2 cells differing in size: a small polar body and a large secondary oocyte.
Until the preovulatory stage, the follicle contains a primary oocyte that is arrested in prophase of meiosis I. During the late preovulatory stage, the oocyte continues meiosis and becomes a secondary oocyte, arrested in metaphase II.