hOw humans exchange gases

1. hOw humans exchange gases Sara al thani 8c

2. The processes of exchanging gases between the atmosphere and the bodies cell is called respiration. Respiration includes several events including breathing. Not all the oxygen breathed in is replaced by carbon dioxide. Breathing in oxygen and out carbon dioxide is called respiration.

3. The respiratory system includes the nose, throat, voice box, windpipe and lungs. • At the top of the respiratory system the nostrils bring air into the nose. Where its filtered warm and moistened.

4. In the nose there are tiny hairs called Cilia. Their job is to protect the nasal passage way. They also filter out dust and other particles that enter the nose through the breathed air.

5. Air can also be breathed in from the mouth. The two airways of the nose and the mouth meet up at the pharynx. The pharynx is located at the back of the throat. • The larynx or the voice box is located at the top of the trachea. The trachea is a pipe that only allows air in which leads to the lungs. This is where our vocal cords are.

6. The bronchioles end in tiny air sacs called alveoli. These enable fresh air to get to the air sacs. These are surrounded by tiny blood vessels or capillaries. The oxygen passes through these air sacs and travels through the capillary walls into the bloodstream. While all this is happening carbond dioxide transfers from the bloodstream into the air sacs, where it leaves the body.

7. Bibliography • http://www.neok12.com/php/watch.php?v=zX5a5b076c436a5b690d0373&t=Respiratory-System • http://people.eku.edu/ritchisong/301notes6.htm • http://www.oxygen-review.com/respiration.html • http://www.neok12.com/Respiratory-System.htm • http://people.eku.edu/ritchisong/301notes6.htm • http://www.webmd.com/lung/respiratory-system • http://www.webmd.com/lung/how-we-breathe