A neuroendocrine signal is a 'classical' hormone that is released into the blood by a neurosecretory neuron (see article on neuroendocrinology). This definition holds for most 'classical' hormones, but there are also paracrine mechanisms (chemical communication between cells within a tissue or organ), autocrine signals (a chemical that acts on the same cell), and intracrine signals (a chemical that acts within the same cell).

In the original 1902 definition by Bayliss and Starling (see below), they specified that, to be classified as a hormone, a chemical must be produced by an organ, be released (in small amounts) into the blood, and be transported by the blood to a distant organ to exert its specific function. If there is too much of the secondary hormone, it may provide negative feedback to the primary hormone, maintaining homeostasis. The endocrine system involves a number of feedback mechanisms, so that often one hormone (such as thyroid stimulating hormone) will control the action or release of another secondary hormone (such as thyroid hormone).

Examples include thyroid hormone, growth hormone, and insulin. Hormones are chemicals that affect the actions of different organ systems in the body. This is a system of glands which secrete hormones. Hormones have many different functions and modes of action one hormone may have several effects on different target organs, and, conversely, one target organ may be affected by more than one hormone.Įndocrinology is the study of the endocrine system in the human body. Therefore, endocrine glands are regarded as ductless glands.

The endocrine system consists of several glands, all in different parts of the body, that secrete hormones directly into the blood rather than into a duct system. Specializations include behavioral endocrinology and comparative endocrinology. It is also concerned with the integration of developmental events proliferation, growth, and differentiation, and the psychological or behavioral activities of metabolism, growth and development, tissue function, sleep, digestion, respiration, excretion, mood, stress, lactation, movement, reproduction, and sensory perception caused by hormones. Thyroid function tests, Blood sugar levelsĮndocrinology (from endocrine + -ology) is a branch of biology and medicine dealing with the endocrine system, its diseases, and its specific secretions known as hormones. Illustration depicting the primary endocrine organs of a femaleĭiabetes, Thyroid disease, Androgen excess

Hormones endocrine system elementary