mechanisms+of+breathing+rich

1. Define inspiration, expiration inspiration is the contraction of moving oxygen into the lungs, expiration is the expulsion of carbon dioxide. 2. Where are the intercostal muscles? the intercostal muscles are the muscles used to suck air into the lungs and to press them out. 3. Where is the diaphragm muscle? The diaphragm muscle is between the ribs. 4. The lungs are in a "sealed" off thoracic cavity. Describe this cavity. Why is it considered "sealed"? the cavity is between the diaphragm and the ribs which makes it a little closed in cavity because it is blocked off by the ribs. 5. Describe the diaphragm and intecostal muscles during inspiration. The lungs expand during inspiration which makes the whole thorctic cavity expand, also the intercostal muscles enable the ribs to move in and out. The The downward movement of the diaphragm enables the air to move down into the lungs. 6. Air does NOT force open the lungs. So why does air enter the lungs? The diaphragm and intercostal muscles suck the air in because the air pressure in the alveoli decreases. 7. Passive Recoil occurs during expiration. What does that mean? This is when the muscles used to inhale air relax and recoil due to the elastic properties of the thoracic walls and lungs. when the body is relaxed and the pressure releases the air from the lungs. 8. Why is air pushed out during expiration? because the diaphragm and intercostal muscles reverse and air is forced out of the lungs. 9. How can you achieve maximum inspiratory effort? expanding diaphragm and thoracic cavity fully by using other muscles in back and chest. 10. How can you force expiration which is usually passive? by doing heavy exercise which doesn't explain how you can simply force out an exhale. i would assume by flexing or controlling stomach or chest muscles. 11. Do you use your total lung capacity when you breathe? What do you use? No, maximum lung capacity is not used in normal breathing, instead "tidal" capacity is used in regular breathing. 12. Why are the nasal cavities, trachea, bronchii, and bronchioles considered "dead air space"? because they cannot be used for any exchange, they are useless basically. 13. How should you breathe to get the most fresh air to your alveoli? Why? Deep and slow so taht the new fresh air goes to the lungs alveoli and is not used for any sort of gas exchange.