Respiratory System  - The system that brings oxygen into the body and releases carbon dioxide into the atmosphere, Lungs - Either of the two main organs of the respiratory system, Respiration - The exchange of gases between the body and the outside air, Pharynx - Throat, Trachea - Windpipe, Bronchus - Structures that take air into the lungs, Alveoli - Air enters the _____ and oxygen goes through the wall of the _____ and into the blood, Circulatory System - The system that circulates blood throughout the body, Blood Vessels - Tubular structures that carry blood through tissues and organs, Heart - Hollow muscular organ that pumps the blood through the circulatory system, Arteries - Vessels that carry blood away from the heart, Veins - Vessels that carry blood to the heart, Capillaries - Branching blood vessels that connect arteries and veins, Blood - Fluid connective tissue that circulates through the blood vessels in the body, Red Blood Cells - Keep tissues alive by bringing oxygen to and taking carbon dioxide out,

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