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the musculoskeletal system the cardio-vascular system human skeletal human skeleton skeletal musculo-skeletal system bones joints the joints bones and joints the humans skeletal system the human skeleton system hairs and nails of humans protective system of body the skin covering of body skin of humans integumentary system surface of body human skin heart of human the human heart heart the cardio cardiac system human heart heart the heart the capillaries blood pressure the arteries and veins the vessels the vascular system muscles mucles body muscles muscles of human boyd the muscular system bodyframework the bones and joints