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Pleura is double membrane sac which envelops:

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Important Questions on Breathing and Respiration

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O2 and CO2 are exchanged at the alveolar level by simple diffusion mainly due to the -
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Alveoli become enlarged and damaged with reduced surface area in heavy smokers. This condition is known as -
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In human beings, concentrations of CO2 in the inspired and expired air respectively are -
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Gaseous exchange between blood and alveolar air across respiratory membrane occurs by -
 
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Rate of breathing is controlled by -
 
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The blood leaving the lungs has its haemoglobin oxygenated and unloads its oxygen to the tissues, because -
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Rate and depth of respiration shall increase, when -