The hormonal system and glands

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The hormonal system consists of endocrine glands, which are groups of specialised cells that secrete hormones. Hormones are often referred to as chemical messengers and are secreted when the gland is stimulated. The hormones diffuse directly into the bloodstream where they travel through your body. They diffuse out of the bloodstream throughout your body but each hormone will only bind to its specific receptor which can be found on the membrane of some cells, called target cells. The hormones trigger a response in the target cells ( the effectors).

A hormone is known as the first…

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