(D) Dead space air refers to the volume of air that remains in the respiratory passages (bronchial tree) and does not participate in gaseous exchange.

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The air left in the bronchial tree

(D) Dead space air refers to the volume of air that remains in the respiratory passages (bronchial tree) and does not participate in gaseous exchange.This volume is approximately $150 \, ml$ in a healthy adult.Since this air does not reach the alveoli,it is not involved in the actual process of respiration.

Class 11 Biology Breathing and Exchange of Gases Respiratory volumes and capacities

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Dead space air is

A
The amount of air remaining in the alveoli
B
The amount of air left behind in lungs at the end of deep expiration
C
The amount of air taken in and out
D
The air left in the bronchial tree

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Breathing and Exchange of Gases

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Respiratory volumes and capacities

The vital capacity of the lung is equal to: (in $, ml$)

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Listed below are four respiratory capacities $(i-iv)$ and four jumbled respiratory volumes of a normal human adult. Which one of the following is the correct matching of two capacities and volumes?

Respiratory capacities Respiratory volumes

$(i)$ Residual volume $2500 \; mL$

$(ii)$ Vital capacity $3500 \; mL$

$(iii)$ Inspiratory reserve volume $1200 \; mL$

$(iv)$ Inspiratory capacity $4500 \; mL$

Respiratory capacities	Respiratory volumes
$(i)$ Residual volume	$2500 \; mL$
$(ii)$ Vital capacity	$3500 \; mL$
$(iii)$ Inspiratory reserve volume	$1200 \; mL$
$(iv)$ Inspiratory capacity	$4500 \; mL$