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Respiratory system
The respiratory system collects oxygen and releases carbon dioxide. Air enters through the nose and mouth then travels through the trachea and bronchi, which divide into bronchioles ending in alveoli. The alveoli are surrounded by capillaries that exchange oxygen and carbon dioxide through the thin alveolar walls. Oxygen is absorbed into the bloodstream and carried throughout the body by arteries while carbon dioxide is absorbed and travels through the bronchioles, bronchi, trachea and out through the mouth and nose. The diaphragm and rib muscles help draw air in and push it back out through inhalation and exhalation.
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Respiratory system
- 1.
- 2. The respiratory systemcollects oxygen and gets rid (expel) carbon dioxide. The combination of oxygen and nutrients makes the energy for our body. Oxygen + nutrients= energy
- 4. 1. Nose andmouth When we breathe in, air enters the nose and mouth. Then, it goes to the pharynx and trachea (windpipe).
- 5. 2. The tracheaand the bronchi ( 1 bronchus = two bronchi) The trachea is divided into two bronchi. Bronchi are divided into many bronchioles.
- 6. Bronchioles are likethe branches of a tree.
- 7. At the endof each bronchiole there is a small bag called alveolus. Alveoli are covered with lots of capillaries. Some capillaries carry oxygen (red) and other capillaries carry carbon dioxide (blue). 3. The alveoli (1 alveolus = many alveoli)
- 8. 4. The exchangeof gases The capillaries that are in red absorb oxygen. This oxygen goes to the arteries and arteries carry/transport it to the rest of the body. The capillaries that are in blue absorb carbon dioxide.
- 9. 5. Carbon dioxideis released The carbon dioxide goes from the capillaries to the alveoli. Then it goes to the bronchioles and then to the bronchi. After that it goes up to the trachea. Finally, it is released through the mouth and nose.
- 10. 5. The diaphragm Itis a muscle. As every muscle, it contracts and relaxes.
- 11. When we breathein: - The diaphragm contracts. - The diaphragm moves down. - The ribs expand. - This is called inhalation.
- 12. When we breatheout: - The diaphragm relaxes. - The diaphragm moves up. - The ribs go down. - This is called exhalation.