Sperm

Sertoli cells
1.       Inhibin
2.       Androgen-binding protein (ABP)
3.       Mullerian inhibiting substance (MIS)
4.       Estrogen

GLUT 5
Fructose transport
Jejunum, sperm, intesti

Inhibin is produced by the Sertoli cells of the testes when they are stimulated by follicle-stimulating hormone (FSH). Inhibin then inhibits further secretion of FSH by negative feedback on the anterior pituitary. The Leydig cells synthesize testosterone. Testosterone is aromatized in the ovaries.

The two testes of the human adult form up to 120 million sperm each day.