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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
Identify True/False statement. Correct false statement to make it true.
Leydig cells synthesise androgens.
Give appropriate biological/technical terms for the following:
The accessory gland in human males whose secretion activates the
sperms.
Draw a labelled diagram of L.S. of human testis.
State the function of Testes.
Given below is the schematic diagram of the sectional view of the human male reproductive system.
Name the parts numbered 1-11.
Given on the right is a diagram which represents the reproductive organs of a man:
(i) Write the names of the parts numbered 1 to 16.
(ii) Give two functions of the part 6.
(iii) Name three components of the fluid which may be found in the tube labeled 2.
(iv) What is the main function of the part labelled 3?
Name the Following
The tubular knot fitting like a cap on the upper surface of the testes.
How is the semen produced?
Write the functions of Seminal vesicle
Draw a neat and labelled diagram.
Human male reproductive organs
Name the secondary sex organs in males.
Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
Identify the condition in wtrich the testis fails to descend from abdomen into scrotum, leading to sterility.
Identify the number of spermatids produced from 1 secondary spermatocyte.
Identify the component(s) of seminal fluid.
In the male reproductive system, the vasa deferens joins the ____________.
The ______ lead to vas deferens that ascends to the ______ and loops over the ______.
Which of the following produces sperms in spermatogenesis?
Sertoli cells are regulated by the pituitary hormone known as ______.
Seminal plasma in human males is rich in ______.
Spot the odd one out from the following structures with reference to the male reproductive system.
In human males, the testes lie in the scrotum, because it helps in the ______
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: In the male reproductive system, the transport of sperm takes place in a fluid that also provides nutrition.
Reason: Protective glands and seminal vesicles secret in the vas deferens.
Write briefly about the Testis.
Give significance of Leydig's cells.
The packing tissues between the coils of the seminiferous tubules are called as ______.
Name these:
3 male accessory glands in humans.
The prostate gland is a single gland located at which position?
What percentage of total semen volume does the prostate gland contribute?
