Erectile dysfunction : video

* What are the causes of erectile dysfunction ?

* How to erctile dysfunction ?

* What are the method of erectile dysfuncyion treatment ?

Steps of spermatogenesis : video

* Where does spermatogenesis occur ?
* What are the steps of spermatogenesis ?
* How many are chromosomes in primary spermatocyte and spermitid ?

* What is the relation between LH, FSH hormones and menstrual cycle ?

* What are the changes which occur in the ovary during the following phases :

follicular phase, ovulation phase and luteal phase ?

*What is happened for corpus luteum when pregnancy doesn't occur ?