The seminiferous tubules of the testis open into the vasa efferentia by:

The prostatic fluid forms about . . . . . . of the total volume of semen. (in $\%$)

Failure of the descending testis into the scrotum is known as:

If for some reason the $vas deferens$ in the human reproductive system becomes blocked, the reproductive cells will not be able to be transported from:

Give scientific reasons: When a male is sexually excited,the epididymis wall shrinks/contracts.

$A$: Leydig cells synthesize and secrete testicular hormones called androgens.
$R$: Leydig cells are located between the Sertoli cells.