The ____ is a system of organs that allows blood to transport substances to the cells of the body. It also transports ____ away from the cells. Each ____ in our body needs food and oxygen in order to get energy. Some cells also need substances such as hormones to control the functions of the cell. Each cell in our body needs to get rid of waste such as ____ and water. The circulatory system picks up ____ from the digestive system and takes it in the blood to all of the cells in the body. The circulatory system picks up ____ from the lungs and takes it in the blood to all the cells in the body. The circulatory system picks up waste from the cells and carries it in the ____ to the lungs and kidneys to be expelled from the body.

Why do we need a circulatory system?

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