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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
Body breaks up into several fragments and each fragment starts to live as a new individual. This is ______ type of reproduction.
Sex organs produce gametes which are diploid.
Answer the following type of question Assertion (A) and Reason (R).
(A) - In human males, testes are extra-abdominal and lie in scrotal sacs.
(R) - Scrotum acts as a thermoregulator and keeps the temperature lower by 2°C for normal sperm production.
Mention the differences between spermiogenesis and spermatogenesis.
During spermatogenesis, spermatogonium grows in size to become ______.
The secondary oocyte enter into the fallopian tube through the ______.
Identify the diploid cell.
Which of the following occurs during maturation phase of spermatogenesis?
Identify the longest period of menstrual cycle.
Select the correct sequence of oogenesis.
Identify the correct stages (P - S) in the given diagram of spermatogenesis.
Four primary spermatocytes give rise to ______.
Which of the following is diploid?
The human male gamete is usually about ______ in length.
Extrusion of second polar body from egg nucleus occurs ______.
Acrosome reaction in sperm is triggered by ______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
Connective tissue around seminiferous tubules possess endocrine cells called ______.
Corona radia is made up of ______.
Cells of corona radiata remain grouped together by ______.
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Fetal sex can be determined by examining cells from amniotic fluid looking for:
If for a species 2n = 16, then during Ist prophase and IInd prophase of the meiotic division of a cell, how many tetrads and diads will be formed:
In human females, meiosis II is not completed until:
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Meiotic division of the secondary oocyte completed ______.
Distinguish between human sperm and ovum.
Complete the analogy with respect to the structure of sperm.
Nebenkern : ‘X’ : : Acrosome is formed from : ‘Y’
