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Definition:  a gland (as a sweat gland, a salivary gland, or a kidney) that releases a secretion external to or at the surface of an organ by means of a canal or duct

Example: an example of an exocrine gland is a sweat gland. The sweat gland is secreting water along with salts in order to control body temperature

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Definition: Glands which secrete hormones directly into the blood stream. Endocrine glands do not use ducts in order to release hormones. Additionally, endocrine glands release only hormones, while exocrine glands release generally secretory products such as sweat and sebum.

Example: Thyroid glands regulate metabolism through the release of the hormones triiodothyronine (T3) and thyroxine (T4) through the blood stream.

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Definition: a cell protein that binds a specific hormone; this binding mediates a cellular response. This allows the hormone to have an effect on the cell.

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Definition: Cells where hormones have an effect. Target cells have specific receptors which allow the hormone to bind to the cell. This results in only specific cells being affected by the hormone even though it is released throughout the bloodstream.

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Definition: Glands are specialized cells which removes material or excess hormones from the blood, and secrete hormones into the blood stream in order to maintain homeostasis. These glands are regulated by the hypothalamus and the pituitary gland in the brain.

Example: The pineal gland manages the sleep cycle by releasing melatonin, a hormone which causes the feeling of sleepiness.

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Definition: The endocrine system is composed of numerous organs/glands which regulate hormone production throughout the body. This system is made of various glands within the brain and within the body which work to maintain homeostasis.

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Definition: any one of the many circulating chemical signals found in all multicellular organisms that are formed in specialized cells, travel in body fluids, and coordinate the various parts of the organism by interacting with target cells

Example: the pituitary gland releases the growth hormone which stimulates protein production, affecting growth and development as well as fat distribution