The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic. The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes. The heart is located in the middle compartment of the mediastinum in the chest.
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alveoli anatomical apical arteries artery atria blood bronchi bronchioles capillaries carbondioxide cardiac cardiovascular cavity cell chest circulatory diaphragm epithelial erythrocytes heart heartbeat hemoglobin lungs microanatomy oxygen pleura pulmonary respiratory septum thoracic throat tissue trachea valves vein ventricles vessels
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