Question

please answer 19 and 20

19. Know the following terms (a) vital capacity (b) tidal volume (c) residual volume (d) expiratory reserve volume (e) inspiratory reserve volume 20. Know the gaseous composition of the atmosphere at sea level. If the atmospheric pressure today is 760 mm Hg, what is the partial pressure of Co, O2, and N2?

Answer 1

A)Vital capacity =. Amount of air that can be exhaled forcefully after forceful inspiration.

TV+IRV+ERV= 4800ml

B) Tidal volume(TV) = amount of air inspired / expired with each normal breath = 500ml

C) Residual volume = volume of air remaining in the lungs after most forceful expiration = 1200ml

D) Expiratory reserve volume = volume of air that can be exhaled out of lungs over and above tidal volume on forceful expiration.= 1200ml

E)Inspiratory reserve volume = volume of air that can be inhaled into the lungs over and above the tidal volume on forceful inspiration = 3100ml

Question 20

Partial pressure of a gas is the pressure of single type of gas in mixture of gases.

Gaseous composition of the atmosphere at sea level is as follows

78.09% nitrogen

20.95% oxygen

0.93% argon

0.04% carbon dioxide

O.17℅ other gases

At sea level Total Alm. pressure - 760 mm Hg Partial pressure of oxygen [fo] = 217 of 760 mm Hg = 159 mm Hg Partial pressure of co [co] = 0.004% of 760 mm ng = 0.3 mm Hg Partial pressure of N. [P., D = 781 of 760 mm Hg Partial pressure ofer = 596 mmHg

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