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The nervous system in the human body has 2 main parts. The parts are called the central nervous system and the peripheral nervous system. The central nervous system involves the brain and the spinal cord, and the peripheral nervous system includes the nerves in your body.

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The circulatory system, which is made up of the heart and blood vessels, supports the respiratory system by bringing blood to and from the lungs. The circulatory system helps deliver nutrients and oxygen from the lungs to tissues and organs throughout the body. It also helps remove carbon dioxide and waste products. Your lungs are on each side of your heart, inside your chest cavity. They are the main organs of the respiratory system. The right lung is divided into three sections, and the left lung is divided into two sections. Your left lung is slightly smaller than your right lung, since your heart takes up some space on the left side. When you breathe in, air enters your airways and travels down into the air sacs, or alveoli, in your lungs. This is where gas exchange takes place.

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The heart is an organ about the size of your fist. This system is a network of blood vessels, such as arteries, veins, and capillaries. Those things carry blood to and from all areas in your body. Blood also carries carbon dioxide to your lungs so you can breathe it out. Inside your heart, valves keep blood flowing in the right direction. A healthy heart supplies your body with the right amount of blood at the rate needed to work well.

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The digestive system is made up of the digestive tract (the gut) and other organs like the liver, pancreas and gall bladder. It is where your body breaks down food and absorbs nutrients. The digestive system is a long, twisting tube that starts at the mouth and goes through the esophagus, stomach, small intestine, and the large intestine. When you eat, your teeth chew food into small pieces. Glands in your cheeks and under your tongue make saliva that coats the food. This makes it easier to chew and swallow. Saliva also contains enzymes that start to digest the carbohydrates in food.

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The muscular System is filled with special cells called muscle fibers. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. The action of bones, joints, and skeletal muscles produces daily movements like walking and running. Skeletal muscles also produce more subtle movements that result in some facial expressions like eye movements. Muscle contraction also fulfills some other important functions in the body, such as posture, joint stability, and heat production.