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Biology : Human Respiratory system
Given the QUESTION, identify the ANSWER
1. Alveoli
Gaseous exchange occurs in alveoli. Due to the presence of alveoli, surface area of the lungs for exchange of gases increases to a great extent. 
2. B
3. B
The blue arrows in the following diagram denote the passage of air in the respiratory tract after entering through the nostrils.
4. B
Gaseous exchange occurs in lungs.
5. C
6. D
Spirometer is an instrument used to measure various lung volumes and lung functions.
7. E
Diaphragm is a respiratory muscle which lies underneath the lung bases.
8. Energy
In the tissues, glucose reacts with oxygen to produce energy which is used in various cell activities. Water and CO2 are formed as by-products.
9. Epiglottis
10. Larynx
Voice is produced in the larynx; therefore it is also known as the voice box.
11. Red blood cells
Hemoglobin present in the red blood corpuscles (RBCs) carries oxygen to different parts of the body.
12. True
Cartilagenous rings prevent the trachea from collapsing.
13. False
Hairs and mucus present in the nasal cavity trap the foreign particles and bacteria and thus prevent them from entering the body. This function cannot be achieved when we breathe through the mouth.
14. False
Various metabolic activities of the body need oxygen for energy and produce CO2 as an end product. This exchange of gases at the cellular level is known as cellular respiration.
15. False
It is 'pleura'. Pericardium covers the heart.
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