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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 side by two types of cells, namely spermatogonia and sertoli cells respectively. Spermatogonia are male germ cells that produce primary spermatocytes via 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 seminiferous tubules. These cells secrete the male hormone called testosterone.
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संबंधित प्रश्न
Write the location and function of the Sertoli cells in humans.
Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
List two functions performed by the testis in human beings.
find odd one from following: Thymine, Cytosine, Adenine, Pepsin.
Why is it important that a very large number of sperms should be present in the semen ?
Name the following :
The body part in which the testes are present in a human male.
Explain the term Scrotum.
Name the Following
The accessory gland in human males whose secretion activates the sperms.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Cowper’s gland opens into the urethra.
The increased level of estrogen and progesterone is responsible for menstruation.
Identify the INCORRECTLY labelled structure in the given diagram of the male reproductive system.
The spermatozoa from seminiferous tubules pass into ______.
Identify the correct sequence of layers that cover the testis (outside to inside).
How many spermatozoa will be produced from 10 million spermatids?
In humans, male germs cells differentiate into ______ at the end of first meiotic division.
Male hormone is produced in the testis by cells of ______.
Sertoli cells are regulated by the pituitary hormone known as ______.
Seminal plasma in humans is rich in ______.
Spot the odd one out from the following structures with reference to the male reproductive system.
Seminal plasma, the fluid part of semen, is contributed by.
- Seminal vesicle
- Prostate
- Urethra
- Bulbourethral gland
Mark the odd one.
Along the path of the vas-deferens the secretions of which gland provide nutrition to the sperms?
______ is the smallest cell in males.
______ carries sperms to the seminal vesicles.
Give reasons for the following
Scrotum remains outside the body of human males.
Explain the function of the following structure in the human male reproductive system.
Leydig cells
Which of the following provides a proof for forensic test in case of rape?
The male accessory gland whose secretion neutralizes the acidity of the urethra and vagina is ______.
Write important function of the following:
Testis
The figure given ahead is an organ system of humans. Study the same and answer the following questions.
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- Identify the organ system.
- Label the guidelines 1 to 7.
- Write one important role of parts 3 and 6.
- Name the cells of part 1 that produce testosterone.
- What is the significance of the part 1 being located in a separate sac suspended outside the body?
