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The circulatory system includes the heart, arteries, veins, capillaries, and blood. The heart functions as a muscular pump that helps force blood through the blood vessels. The blood serves as a fluid for transporting gases, nutrients, hormones, and wastes. It carries oxygen from the lungs and nutrients from the digestive organs to all body cells, where these substances are used in metabolic processes. The blood also transports hormones from various endocrine glands to their target tissues, and carries wastes from body cells to the excretory organs, where the wastes are removed from the blood and released to the outside. (information found in _human anatomy & physiology, sixth edition, pages 18-19, by john w. hole, jr.)

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