Estrogen is secreted by

Draw a labeled diagram of a Graafian follicle.

The termination of the process of oogenesis is indicated by the formation of . . . . . . .

Select the appropriate option for gametogenesis.

Explain the difference between the following terms:
$(1)$ Spermatid - Spermatozoa
$(2)$ First polar body - Second polar body

Androgen binding protein,which helps in concentrating testosterone in the seminiferous tubule,and which inhibits $ICSH$ secreted by the anterior pituitary and $GnRH$ production by the hypothalamus,is secreted by: