The diaphragm separates the chest cavity from the abdominal cavity and is the main respiratory muscle. The trachea is the main airway to the lungs and is divided into two large primary bronchi. The upper part of the pharynx lets air pass through, while the lower part allows food and liquids to pass. This flap of cartilage stops food from entering the trachea. In the larynx, vocal cords vibrate to produce human speech.
Heart Supplies the body with fresh blood.
The central largest artery that channels oxygenated blood through the body.