Topics from A to Z: Letter T

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    The innate and adaptive immune systems

    The immune system fights germs on the skin, in the tissues of the body, and in bodily fluids such as blood. It is made up of two parts: the innate (g...

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    How does the thyroid gland work?

    The thyroid gland is a vital hormone-producing gland: It plays a major role in the metabolism, growth and development of the human body. It helps to ...