1. The Respiratory System

2. What is the Respiratory System? Your respiratory system is made up of the organs in your body that help you to breathe. Remember that Respiration = Breathing The goal of breathing is to deliver oxygen (inhale) to the body and to take away carbon dioxide (exhale)

3. Mouth & Nose Air enters the body through either the open mouth or the nose. It travels down the trachea to the lungs, where the oxygen in it passes into the bloodstream. Tiny hairs in the nose trap unwanted particles while a sticky liquid called mucus catches many of the germs before they all can go too far into the respiratory system. The mucus also warms and moistens the air.

5. Epiglottis A flap of skin in the throat that blocks the windpipe when food or liquid is being swallowed. This prevents food from going down the wrong pipe.

7. Larynx The part of the respiratory system that contains your vocal cords. It is commonly called the voice box. The larynx is the place where moving air being breathed in and out creates voice sounds.

9. Trachea The trachea is a 4 ½ inch long tube. It is sometimes called the windpipe. The trachea filters the air we breathe and branches into the bronchi tubes.

11. Bronchi Tubes The bronchi are two air tubes that branch off of the trachea and carry air directly into the lungs. One bronchi tube goes to the left lung, and one bronchi tube goes to the right lung. Each bronchi tube divides off into smaller tubes called bronchioles.

13. Alveoli Bronchioles eventually lead to tiny, stretchy sacs called alveoli. These air sacs blow up like tiny balloons when you breathe in. Oxygen from the air passes through the walls of the alveoli while carbon dioxide is passed out.

14. Alveoli

16. Lungs The lungs are the main organs of the respiratory system. In the lungs oxygen is taken into the body and carbon dioxide is breathed out.

17. Lungs The red blood cells are responsible for picking up the oxygen in the lungs and carrying the oxygen to all the body cells that need it. The red blood cells drop off the oxygen to the body cells, then pick up the carbon dioxide which is a waste gas product produced by our cells. The red blood cells transport the carbon dioxide back to the lungs and we breathe it out when we exhale.

18. Lung Defenses Cilia: waving hair-like projections lining the respiratory tract that help to trap/catch bacteria. Mucus: sticky liquid that traps debris and germs in order to help get rid of it.

19. Alveoli

20. Video Clip BrainPOP- Respiratory System