any of several perissodactyl mammals constituting the family Rhinocerotidae of SE Asia and Africa and having either one horn on the nose, like the Indian rhinoceros (Rhinoceros unicornis), or two horns, like the African white rhinoceros (Diceros simus) They have a very thick skin, massive body, and three digits on each foot.
GnRH is a hormone that is produced in the hypothalamus region of the brain. Once produced, GnRH moves through the bloodstream to the pituitary gland. There, it binds to certain receptors, which signals the pituitary gland to create two more hormones: LH and follicle-stimulating hormone (FSH).
GnRH is produced in the hypothalamus when estrogen levels are high and progesterone is low. It travels to the anterior pituitary through a portal vessel. The Anterior pituitary produces FSH and LH in response to GnRH. FSH, which stimulates follicle growth and maturation, is secreted and its levels begin to rise.