2. Learning Target

3.  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.

4.  The respiratory track is divided into the upper respiratory tract and the lower respiratory tract.

5.  Epiglottis  Larynx  Mouth  Nose  Pharynx

6.  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.

7.  The pharynx is a short muscular structure that serves as a passage for food and air.

8.  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.

9.  Bronchi  Two lungs  Trachea

10.  Known as the wind pipe  Extends for the larynx to the junction of the lungs where it divides into two bronchi.

11.  Passageways, which branch off from the trachea and go into the lungs.

12.  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.

13.  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

14.  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.