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प्रश्न
Name the hormones involved in regulation of spermatogenesis.
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उत्तर
Hormones that regulate spermatogenesis include GnRH, LH, FSH and androgens. After sexual maturity, spermatogenesis starts due to the secretion of gonadotropin releasing hormone (GnRH) from the hypothalamus of the brain. GnRH acts on the pituitary gland and stimulates secretion of luteinizing hormone (LH) and follicle stimulating hormone (FSH). LH induces the Leydig cells of the testis to produce male sex hormones called androgens. High levels of androgens stimulate the process of spermatogenesis. FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.
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संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
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.
Ovulation is induced by a hormone called ______.
Body breaks up into several fragments and each fragment starts to live as a new individual. This is ______ type of reproduction.
The glandular accessory organ which produces the largest proportion of semen is ____________.
Mammalian egg is ____________.
Formation of ____________ is an indication of the termination of oogenesis.
500 spermatozoa are formed from ____________ secondary spermatocytes.
Identify the CORRECT sequence of events.
Four primary spermatocytes give rise to ______.
Draw a labelled diagram of a Graafian Follicle.
How many sperms are formed from a secondary spermatocyte?
Extrusion of second polar body from egg nucleus occurs ______.
Acrosome reaction in sperm is triggered by ______.
After ovulation, Graafian follicle regresses into ______.
There is no cell division involved in ______.
It The cell division in secondary oocyte is suspended at ______.
How many sperms are formed from 4 primary spermatocytes?
In spermatogenesis, reduction division of chromosome occurs during conversion of ______.
Acrosome is a type of ______.
The prostate gland and seminal vehicle perform the function of ______.
Mark the odd one.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
In human females, meiosis II is not completed until:
During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?
Name the germinal layers from which the following organs develop: Tongue, heart, sweat glands, vagina, mammary glands, kidney.
Distinguish between human sperm and ovum.
Select a correct pair of cells with identical set of chromosomes.
