Question

Given these lung volumes:(1) tidal volume = 500 mL(2) residual volume = 1000 mL(3) inspiratory reserve volume = 2500 mL(...


Given these lung volumes:
(1) tidal volume = 500 mL
(2) residual volume = 1000 mL
(3) inspiratory reserve volume = 2500 mL
(4) expiratory reserve volume = 1000 mL
(5) dead space = 1000 mL
The vital capacity is
a. 3000 mL. d. 5000 mL.
b. 3500 mL. e. 6000 mL.
c. 4000 mL.

Answer

The function of the respiratory system is to breathe in oxygen (required for the breakdown of food) and to breathe out carbon dioxide. Thus, respiration can be defined as the process of exchanging oxygen with carbon dioxide.

 

 

The functional abilities of the human respiratory system can be studied by measuring its vital capacity. The term vital capacity is defined as the maximum amount of air that can be expelled by the lungs of an individual after inhaling to the maximum capacity. It is calculated by summing the values of expiratory reserve volume (ERV), tidal volume (TV), and inspiratory reserve volume (IRV). Thus, the value of vital capacity will be the summation of 500ml (TV), 1000ml (ERF), and 2500ml (IRF), which is equal to 4000ml.

Hence, the correct answer is option ‘c.’

Option ‘a’ is incorrect because the value 3000ml is lower than the calculated value of vital capacity.

Option ‘b’ is incorrect because the value 3500ml is lower than the calculated value of vital capacity.

Option ‘d’ is incorrect because the value 5000ml is greater than the calculated value of vital capacity.

Option ‘e’ is incorrect because the value 6000ml is greater than the calculated value of vital capacity.

Hence, the value of the vital capacity, which is calculated by summing the values of the three lung volumes, that is, the expiratory reserve volume (1000ml), tidal volume (500ml), and inspiratory reserve volume (2500ml), is equal to 4000ml.

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