Pleura is double membrane sac which envelops:

Important Questions on Breathing and Respiration

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 58

${\mathrm{O}}_2$ and ${\mathrm{CO}}_2$ are exchanged at the alveolar level by simple diffusion mainly due to the -

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 59

Emphysema is characterised by -

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 60

Alveoli become enlarged and damaged with reduced surface area in heavy smokers. This condition is known as -

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 61

In human beings, concentrations of ${\mathrm{CO}}_2$ in the inspired and expired air respectively are -

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 62

Gaseous exchange between blood and alveolar air across respiratory membrane occurs by -
 

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 64

Rate of breathing is controlled by -
 

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Alpha Question Bank for Medical: Biology>Chapter 17 - Breathing and Respiration>Exercise-3>Q 65

The blood leaving the lungs has its haemoglobin oxygenated and unloads its oxygen to the tissues, because -

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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 -