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| The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it. |
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| The digestive system is made up of organs that break down food into protein, vitamins, minerals, carbohydrates, and fats, which the body needs for energy, growth, and repair. |
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| The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. Hormones are chemicals that control body functions, such as metabolism, growth, and sexual development. |
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| The immune system is a body's defense system against infections and diseases. Organs, tissues, cells, and cell products work together to respond to dangerous organisms (like viruses or bacteria) and substances that may enter the body from the environment. |
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| The lymphatic system is also a defense system for the body. It filters out organisms that cause disease, produces white blood cells, and generates disease-fighting antibodies. It also distributes fluids and nutrients in the body and drains excess fluids and protein so that tissues do not swell. |
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| The muscular system is made up of tissues that work with the skeletal system to control movement of the body. Some muscles, like those in arms and legs, are voluntary. Other muscles, like the ones in the stomach, heart, intestines, and other organs, are involuntary. This means that they are controlled automatically by the nervous system and hormones. |
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| The nervous system is made up of the brain, the spinal cord, and nerves. One of the most important systems in the body, it is the body's control system. It sends, receives, and processes nerve impulses through ought the body. These nerve impulses tells muscles and organs what to do and how to respond to the environment. |
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