Answer:
1. Follicle-stimulating hormone (FSH), luteinizing hormone (LH), and testosterone are the key hormones involved in the functioning of the male reproductive system. The pituitary gland produces FSH and LH.
2. Follicle-stimulating hormone, luteinizing hormone, estrogen, and progesterone are the four key hormones involved in the menstrual cycle (chemicals that stimulate or regulate the activity of cells or organs).
3. FSH and LH activate Sertoli cells and Leydig interstitial cells in the testes of males to aid sperm formation. The testosterone produced by the Leydig cells is also responsible for males' secondary sexual traits. FSH and LH stimulate the production of estrogen and progesterone in females.
