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Each lung is enclosed in a double membrane called as pleura. The membrane which closely covers the lung is-
 

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Important Questions on Breathing and Respiration

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Respiratory system is derived from-
 
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The impulse for voluntary muscles for forced breathing starts in
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Signet ring cartilage of larynx is
 
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In nasal passage, the turbinal bones are present in which of the following groups?
 
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Narrowest and most abundant tubes of lungs are
 
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Number of tracheal rings in a man is