The seminiferous tubules of the testis are lined by the germinal epithelium consisting of which of the following?

Which of the following does $NOT$ produce seminal plasma?

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

Testicular degeneration and other disorders of the reproductive system in mammals are due to the deficiency of:

The path of sperm transport is given below. Provide the missing steps in blank boxes.
$\boxed{\text{Seminiferous tubules}} \to \boxed{\text{Rete testis}} \to \boxed{A} \to \boxed{\text{Epididymis}} \to \boxed{B} \to \boxed{\text{Urethra}}$

Which of the following cells secrete testosterone?