Advertisements
Advertisements
Question
Describe the structure of a seminiferous tubule.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Why are the human testes located outside the abdominal cavity? Name the pouch in which they are present.
Write the location and functions of the following in human testes :
Leydig cells
Humans reproduce ______.
What are the major components of seminal plasma?
Identify True/False statement. Correct false statement to make it true.
Androgens are produced by Sertoli cells.
Identify True/False statement. Correct the false statement to make it true.
Leydig cells are found in the ovary.
____________ contribute about 60% of the total volume of the semen.
Name the following:
The tubular knot fitting like a cap on the upper side of the testis.
Given below is the schematic diagram of the sectional view of the human male reproductive system.
Name the parts numbered 1-11.
Given below is the outline of the male reproductive system. Name the parts labelled 1 to 8 and state their functions. Also name the corresponding structure of part (4) in the female reproductive system.
Sketch the labelled diagram.
Human male reproductive system.
Give the names of hormones related with male reproductive system.
Choose the correct answer:
Removal of testes is called ____________
Differentiate
Urinogenital duct and Ureter.
Give Technical Term:
Name the male reproductive cells of mammals.
Complete the following sentences with appropriate word:
The surgical sterilization of males is known as _________.
State the Location:
Cowper’s glands
Write the functional activity of the following structure:
Seminiferous tubules
How is the semen produced?
Identify the condition in wtrich the testis fails to descend from abdomen into scrotum, leading to sterility.
Identify the INCORRECTLY labelled structure in the given diagram of the male reproductive system.
Identify the number of spermatids produced from 1 secondary spermatocyte.
ln the reproductive system of a male human being, the ejaculatory ducts open into ________.
Each testis is connected to the wall of scrotum by short. fibromuscular band called ______.
The vas deferens receives duct from the seminal vesicle and opens into urethra as ______.
Urethral meatus refers to the ______.
Occurrence of Leydig’s cells and their secretion is ______.
Along the path of the vas-deferens the secretions of which gland provide nutrition to the sperms?
Give two reasons for the appearance of variations among the progeny formed by sexual reproduction.
The shared terminal duct of the reproductive and urinary system in the human male is ______.
