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The total number of alveoli in both lungs of humans is about

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Important Questions on Breathing and Respiration

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 11
The incomplete cartilaginous rings in the trachea are examples of 
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 12
Which is the correct pathway of air passage in the respiratory tract of man?
 
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 13
Which one of the following statement(s) is/are correct?
1. Inspiration occurs only when there is negative pressure in the lungs with respect to the atmosphere.
2. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure.
3. Pressure gradients are generated with the help of the diaphragm and intercostal muscles.
4. Inspiration is initiated by the relaxation of the diaphragm.
5. Contraction of the diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.
 
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 15
Breathing rate is lowest while we are -
 
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 16
Which is the site of actual diffusion of O2 and CO2, between blood and atmospheric air?
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 17
What is the amount of air inspired or expired per minute, by a healthy human adult?
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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 18

The maximum volume of air a person can breathe in after a forceful expiration or maximum of air a person can breathe out after a forceful inspiration is called 

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-4>Q 39
Rate and depth of respiration shall increase, when -