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QUESTION
Q6) Which is correct ? [ MPPMT 1993 ]

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The respiratory center (RC) is located in the medulla oblongata and pons, in the brainstem. The depth of inhalation depends on how fast the respiratory centre of the medulla stimulates the respiratory muscles. On increase of CO2 rate of respiration becomes fast thus option (a) false
Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume. A normal adult has a vital capacity between 3 and 5 litres.
Expiratory reserve volume :the maximum amount of air that can be exhaled after normal exhalation or in simple terms it is the additional air that is forcibly exhaled after exhalation of normal tidal volume. Its value in healthy adults is 1.0 litre in men and 0.7 litres in women. Thus option ‘b’ false
approximately 300 million alveoli were found in human lungs option ‘c’ false
Duringinspiration the diaphragm contracts downward, creating a vacuum that causes a rush of fresh air into the lungs option ‘d’ correct


Answer : (d)