In the Endocrine system there are multiple structures that regulate different hormones, so that many functions can process. There is the hypothalamus, which control the secretions of the pituitary gland by the use of hormones. Thymus releases thymosin, during childhood, which stimulates T cell development and proper immune response. The thyroid produces thyroxin, which regulates metabolism throughout the body. The pancreases produce insulin and glucagon, which regulate the level of glucose in the blood.
Ovaries produce estrogen and progesterone. The testes produce testosterone, which is responsible for sperm production. The pituitary glands produce hormones that regulate many other endocrine glands. Parathyroid glands are four glands that release parathyroid hormone which regulate the level of calcium in the blood. Thenal glands release epinephrine and norepine phaine, which helps the body respond to stress. The pineal gland releases melatonin, which is involved in rhythmic activities.
In the reproductive system there are male structures and female structures. The male structure has the primary male reproductive organ called the testes, which produce sperm. The testes are kept in an external sac called the scrotum, which is kept at a lower temperature. Seminiferous tubules are clusters of hundreds of tiny tubules within each testis. The epididymis is where sperm fully mature after passed through the somniferous tubules. Vas deferens tube is where sperm is moved to next and it extends upward from the scrotum.
The urethra is a tube that leads to the outside body through the penis, and also carries urine from the bladder. The female main organ is the ovaries, which produce eggs. To produce the egg, it is fully matured and released through the openings of one of the two fallopian tubes. It is then passed to the uterus, which is the cavity of an organ. The egg passes the cervix, the outer of the uterus, and is lead outside the body through the vagina, a canal.