Which cells in the testis secrete testosterone?

What is the common duct shared by the reproductive and excretory systems in the human male?

Assertion $(A) :-$ Sperm production occurs in the seminiferous tubules.
Reason $(R) :-$ The seminiferous tubules are lined on their inside by spermatogonia and Sertoli cells.

Select the correct option for Leydig cells.

Compared to a bullock,a bull has higher levels of which of the following?

If for some reason,the $vasa$ $efferentia$ in the human reproductive system get blocked,the gametes will not be transported from: