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Blood vessels (arteries, capillaries, veins)
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Pumps blood and circulates it throughout the body
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Adds oxygen to the blood (and removes carbon dioxide from the blood)
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Nerves (both those that carry impulses to the brain and those that carry impulses from the brain to muscles and organs)
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Directs intentional (and many automatic) actions of the body
Enables thinking, self-awareness, and emotions
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Skin (both the surface that is generally thought of as skin and the underlying structures of connective tissue, including fat, glands, and blood vessels)
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Provides barrier protection between the inside of the body and the external environment
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Provides structure and allows motion of the body
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Red blood cells, white blood cells, and platelets
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Plasma (the liquid part of blood)
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Bone marrow (where blood cells are produced)
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Transports oxygen and nutrients to all the cells of the body (and removes carbon dioxide and waste products)
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Pancreas (the part that produces enzymes)
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Extracts nutrients from foods
Excretes waste products from the body
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Pancreas (the part that produces insulin and other hormones)
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Stomach (the cells that produce gastrin)
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Produces chemical messengers carried in the blood, which direct the activities of different organ systems
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Filters waste products from the blood
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