The glandular (endocrine) organs secrete chemical substances that travel in the bloodstream to enter and act on other organs of the body. These substances are referred to as hormones.
There are many endocrine organs and they give rise to many hormones e.g.
The Pituitary gland produces hormones that stimulate the thyroid, adrenal, ovarian and testicular glands
The Thyroid gland produces thyroid hormones which affect the metabolism of all the cells of the body
The Parathyroid gland produces parathyroid hormone that affect bones and calcium metabolism
The Adrenal glands produce hormones such as adrenaline, noradrenaline, aldosterone, cortisol, DHEA and testosterone to cope with stress and enhance body function
The Ovaries and Testes produce hormones that affect sexual and other functions of the body e.g. mood, muscle and bones
The ability of these glands to produce hormones is affected by your individual genetic makeup, your nutritional status and stress levels