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प्रश्न
Explain the development of a secondary oocyte (ovum) in a human female from the embryonic stage upto its ovulation. Name the hormones involved in this process.
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उत्तर
Oogenesis
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The ovum (egg) is formed by the process of oogenesis.
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It starts during embryonic growth with millions of gamete mother cells (oogonia) forming in the foetal ovary.
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These cells undergo meiosis, but get temporarily arrested at the prophase and are called primary oocytes.
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Before reaching puberty, a large number of primary oocytes degenerate and the remaining ones get surrounded by layers of granulosa cells and new theca and are called secondary follicles.
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The secondary follicles are then converted into tertiary follicles that have a fluid-filled cavity called the antrum. At this stage, the primary oocyte present within the tertiary follicle completes meiosis, which results in the formation of haploid secondary oocyte and a tiny polar body.
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This tertiary follicle further changes into the Graafian follicle. The secondary oocyte is surrounded by the zona pellucida.
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Then the Graafian follicle ruptures to release the ovum by ovulation.
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संबंधित प्रश्न
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
Select the correct sequence of oogenesis.
The immature male germ cells differentiates into ______ at the end of meiosis I.
Which of the following contains a fluid filled cavity called antrum?
Identify the wrong statement from the following.
Cells of corona radiata remain grouped together by ______.
The head of the epididymis at the head of the testis is called ______.
Select the correct sequence of stages of spermatogenesis in a human male ______.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Sketch and label the process of oogenesis.
