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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
Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
Identify True/False statement. Correct false statement to make it true.
Spermatozoa get nutrition from Sertoli cells.
Distinguish between the following pair of terms:
Egg and sperm.
State the function of Testes.
Which one of the following is the correct route that a sperm follows when it leaves the testis of a mammal ?
Describe the functions of the following:
Testis
Describe the functions of the following:
Oviduct
Given below is a diagram of the lateral section of the testis of a man. Study the same and answer the questions that follow:
(i) Label the parts numbered 1 to 4 of the diagram.
(ii) State the functions of the parts labeled 1 and 3.
(iii)What is the significance of the testes being located in the scrotal sac outside the abdomen?
(vi)What is the role played by the inguinal canal?
(v) What is semen?
The diagram shown below is the lateral section of the testis of man. Study it carefully and answer the questions that follow:
(i) Label the part I to 4 of the diagram.
(ii) State the functions of the parts labeled 1 and 2.
Find an odd one out.
Hormones related to male reproductive system.
How is the semen produced?
Cowper's gland is homologous in function to ______
Identify the accessory sex gland consisting of 20-30 separate lobes and secreting about 30% of semen.
Semen is secreted by ______.
ln the reproductive system of a male human being, the ejaculatory ducts open into ________.
How many spermatozoa will be produced from 10 million spermatids?
Which of the following produces sperms in spermatogenesis?
Sertoli cells are regulated by the pituitary hormone known as ______.
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 |
Vas deferens receives the duct of seminal vesicle and forms the ______.
ells of Leydig occur in ______.
Why do only male gametes have a tail?
Crypts of Lieberkuhn are absent in ______.
What are the components of semen?
Which of the following provides a proof for forensic test in case of rape?
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Follicle cells : Ova :: ______ : Sperms.
Choose the odd one out from the group of terms given below and write the category for the remaining terms:
The figure given below is an important gonad of humans. Study the figure and answer the following questions.
 |
- Identify the organ. Write its specific location in the body.
- Label the parts shown in the figure as 1 to 4.
- Write important functions of parts 2 and 4.
- Name one cellular structure and one hormone which are produced in part 3.
- Draw a neat and labelled diagram of the cellular structure mentioned by you in (d).
