Seminiferous tubules are found in

The cells of $Leydig$ produce and secrete .......... .

$A$: The secretions of male accessory glands constitute the seminal plasma,which is rich in fructose,calcium,and certain enzymes. $R$: Fructose serves as a source of energy for the sperms.

Development of epididymis,vas deferens,seminal vesicles,prostate glands and urethra is controlled by

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

Explain the difference between the following terms:
$(1)$ Testosterone - Progesterone
$(2)$ Vasa efferentia - Vas deferens