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What Is the Endocrine System The foundations of the endocrine system are the hormones and glands As the bodys chemical messengers hormones pronounced hor-moanz transfer information and instructions from one set of cells to another Many different hormones move through the bloodstream but each type of hormone is designed to affect only certain cells A gland is a group of cells that produces and secretes or gives off chemicals A gland selects and removes materials from the blood processes them and secretes the finished chemical product for use somewhere in the body Some types of glands release their secretions in specific areas For instance exocrine pronounced ek-suh-krin glands such as the sweat and salivary glands release secretions in the skin or inside the mouth Endocrine glands on the other hand release more than 20 major hormones directly into the bloodstream where they can be transported to cells in other parts of the body The major glands that make up the human endocrine system include the hypothalamus pituitary gland thyroid parathyroids adrenal glands pineal body reproductive glands which include the ovaries and testes The hypothalamus pronounced hi-po-tha-luh-mus a collection of specialized cells that is located in the lower central part of the brain is the main link between the endocrine and nervous systems Nerve cells in the hypothalamus control the pituitary gland by producing chemicals that either stimulate or suppress hormone secretions from the pituitary Although it is no bigger than a pea the pituitary pronounced puh-too-uh-ter-ee gland located at the base of the brain just beneath the hypothalamus is considered the most important part of the endocrine system Its often called the master gland because it makes hormones that control several other endocrine glands The production and secretion of pituitary hormones can be influenced by factors such as emotions and changes in the seasons To accomplish this the hypothalamus provides information sensed by the brain such as environmental
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