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प्रश्न
Describe the structure of a seminiferous tubule.
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उत्तर
The production of sperm in the testes takes place in a highly coiled structure called the seminiferous tubules. These tubules are located in the testicular lobules. Each seminiferous tubule is lined by germinal epithelium. It is lined on its inner surface by two types of cells: spermatogonia and Sertoli cells. Spermatogonia are male germ cells that give rise to primary spermatocytes through meiotic divisions. Primary spermatocytes undergo further meiotic division to form secondary spermatocytes and finally, spermatids. Spermatids later metamorphose into male gametes called spermatozoa. Sertoli cells are known as nurse cells of the testes, as they provide nourishment to the germ cells. There are large polygonal cells known as interstitial cells or Leydig cells just adjacent to the seminiferous tubules. These cells secrete the male hormone called testosterone.
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संबंधित प्रश्न
List two functions performed by the testis in human beings.
Humans are ______.
Describe the human male reproductive system.
What are the major functions of male accessory ducts and glands?
Identify True/False statement. Correct the false statement to make it true.
Leydig cells are found in the ovary.
Differentiate between Human skin cell and Human ovum (number of chromosomes).
Define Spermatogenesis.
State the function of Seminal vesicle.
What happens in a boy’s body under the influence of hormones?
Write important function of the following:
Inguinal canal
Draw a diagram of a mature human sperm. Label any three parts and write their functions.
Differentiate between vas deferens and vasa efferentia.
Sketch the labelled diagram.
Human male reproductive system.
Given below is the schematic diagram of the sectional view of the human male reproductive system.
State the functions of the parts numbered 1, 2, 3, 5, 8 and 11.
Name the Following
Male copulatory organ.
Name the Following
The site of production of sperms in man.
Name the Following
The hormone that stimulates the development of secondary sexual characters in males.
Write the functional activity of the following structure:
Cowper’s gland
Write the functional activity of the following structure:
Seminal fluid
Semen is secreted by ______.
The ejaculatory ducts open into the ______.
Select the MISMATCHED pair.
Increased secretion of which hormone start the process of sperm formation at the time of puberty?
Match between the following representing parts of the sperm and their functions and choose the correct option.
| Column A | Column B | ||
| A. | Head | i. | Enzymes |
| B. | Middle piece | ii. | Sperm motility |
| C. | Acrosome | iii. | Energy |
| D. | Tail | iv. | Genetic material |
In human males, the testes lie in the scrotum, because it helps in the ______
The process of formation of sperms is known as ______.
Accessory glands of male reproductive system are
Give significance of Leydig's cells.
The packing tissues between the coils of the seminiferous tubules are called as ______.
