The circulatory<span> and </span>respiratory systems<span> work together to circulate </span>blood<span> and oxygen throughout the body. Air moves in and out of the </span>lungs<span> through the trachea, bronchi, and bronchioles. </span>Blood<span> moves in and out of the </span>lungs<span> through the pulmonary arteries and veins that connect to the heart
