endocrine

• The thyroid gland is located at the base of the neck, anterior to the trachea.
• A human being depends on reproduction for continued production of species.
• If humans stop to reproduce, the human species would become extinct.
• Reproduction is a normal process controlled by hormones.
• These hormones keep both the male and female reproductive systems to function properly.
• The pituitary gland controls the functions of both the testes and ovaries.
• Into the male system, pituitary gland releases follicle stimulating hormone (FSH) and luteinizing hormone (LH).
• FSH enters the testes to stimulate the Sertoli cells that are responsible for nourishing the sperm cells that the testes produce to facilitate the process of sperm production.
• LH enters the testes to stimulate the interstitial cells called the Leydig cells to make and release testosterone into the testes and the blood.
• Testosterone is responsible for the development of male secondary sexual characteristics and stimulates the process of sperm production in the testes.
• In female reproductive system, the follicles produce estrogen that controls the growth and release of eggs from the ovaries.
• Estrogen and progesterone work together in the female reproductive system.
• Progesterone prepares uterus so that the fertilized egg can grow in it and is also responsible for preventing muscle contraction of the uterus that can cause the egg to detach from the uterus.
• In addition, the hormone inhibin produced by follicle cells inhibits FSH (follicle stimulating hormone) production.
• FSH and LH play in the regulation of estrogen-progesterone levels.
• FSH affects the development of the follicles and maturation of the egg as well as the process of ovulation.
• Fundamental Counting Principle