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From MyMCAT

Much like the nervous system, the endocrine system is used as an information signaling system throughout the body. The endocrine system however is capable of relaying signals to various cell types and organs throughout the body, unlike the nervous system which allows to be transmitted primarily between the central nervous system and muscles.

Where the nervous system uses nerves to conduct information, the endocrine system uses the blood vessels and communicates its messages through hormones. Typical endocrine glands are ductless and secrete their hormones directly into the blood supply that passes through them. These hormones can then travel to distant organs or cells to regulate their target function.

The endocrine glands of the human body consist of the Pineal gland, the Pituitary gland, the Thyroid gland, the Thymus, the Adrenal gland, the Pancreas and the sex organs (the Ovaries and Testes). Please refer to a specific section for more details and questions.

Types of Hormones (Peptide versus steroid) The Endocrine Glands and Hormones The Menstrual Cycle