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Learning Target Governs the gas (oxygen & carbon dioxide) exchange. Brings in oxygen and delivers it to the body cells by way of blood. Picks of carbon dioxide and releases it back into the air. The respiratory track is divided into the upper respiratory tract and the lower respiratory tract. Epiglottis Larynx Mouth Nose Pharynx Air is first brought into the body through the mouth and nose. Air then travels from the nostrils to the pharynx via the nasal cavity. The pharynx is a short muscular structure that serves as a passage for food and air. The larynx, or voice box, is a short tube that connects the pharynx and trachea. The larynx regulates the volume of air in the respiration that helps to produce sound. Larynx is covered by the epiglottis, which prevents food from entering the trachea and going into the lungs. Bronchi Two lungs Trachea Known as the wind pipe Extends for the larynx to the junction of the lungs where it divides into two bronchi. Passageways, which branch off from the trachea and go into the lungs. The major organs in the respiratory system. They contain millions of tiny air sacs called alveoli that are surrounded by capillaries. It is through the walls of the alveoli and capillaries that oxygen and carbon dioxide is exchanged. 6"x 4.5" (¼ sheet) piece of pink or gray construction paper (trachea) two round 9" or 12" pink balloons (lungs) two drinking straws (bronchi) 3 or 4 cotton balls transparent tape medium-size, thin rubber band Step 1. Insert straws into balloons and tape together at top. These are bronchi and lungs. Step 2. Roll construction paper into a tube just round enough to fit over the tops of the straws. Tape closed and place over tops of two straws. This will be the trachea. Step 3. Blowing air into the lungs watch as they expand and contract as you do this.