Q. Which of the following is/are correctly matched?
- Inhalation- ribs moves up
- Exhalation- diaphargm moves down
- Inhaled air- 21% oxygen
Select the correct answer from the codes given below:
Answer:
Only 1 and 3
Notes: During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs. The percentage of oxygen and carbon dioxide in inhaled and exhaled air–
(Inhaled air) - (Exhaled air)
- 21% oxygen - 16.4% oxygen
- 0.04% carbon dioxide - 4.4% carbon dioxide.