Life Science 4.3<br />The Endocrine System<br />
Objectives:<br />Explainwhy the endocrine system is important to the body.<br />Identify five glands of the endocrine system, and describe what their hormones do.<br />Describe how feedback mechanisms stop and start hormone release.<br />Name two hormone imbalances.<br />
Hormones as Chemical Messengers<br />Endocrine system<br />Collection of glands and groups of cells that secrete hormones.<br />Gland<br />group of cells that make special chemical messengers, called hormones, for your body.<br />Hormone<br />Chemical messenger made in one cell or tissue that causes a change in another cell or tissue in another part of the body.<br />
Adrenal Glands<br />Epinephrine – also known as adrenaline, is released in “fight or flight” response.<br />Prepares you to fight or run from danger.<br />
More Endocrine Glands<br />Thyroid gland<br />Controls the secretion of growth hormones for normal body growth.<br />Thymus gland<br />Produces killer T cells that help destroy or neutralize cells or substances that invade your body.<br />Metabolism<br />Sum of all the chemical processes that take place in an organism.<br />
Controlling the Endocrine Glands<br />Endocrine glands control feedback mechanisms in the body.<br />Occasionally, an endocrine gland makes too much or not enough of a hormone. <br />For example, sometimes a child’s pituitary gland doesn’t make enough growth hormone. <br />As a result, the child’s growth is stunted.<br />Hormone Imbalances<br />
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