Which one of the following process does not occur during inspiration in humans?
Important Questions on Respiration and Circulation
Assertion (): Biconcave shape of mammalian facilitates gas exchange.
Reason (): Biconcave shape provides a high surface to volume ratio.
Match the following respiratory capacities and respiratory volumes of a normal human adult?
| Respiratory capacities | Respiratory volumes | ||
| i) | Residual volume | a) | 2800 mL |
| ii) | Vital capacity | b) | 3000 mL |
| iii) | Inspiratory reserve volume | c) | 1100 mL |
| iv) | Inspiratory capacity | d) | 4000 mL |
Select the correct events that occur during inspiration.
(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intrapulmonary pressure increases
(A) The movement of air in and out of the lungs is carried out by creating a pressure gradient between the lungs and atmosphere.
(B) Inspiration can occur if the pressure within the lungs is more than the atmospheric pressure.
(C) Expiration takes place when the intrapulmonary pressure is lesser than the atmospheric pressure.
(D) The diaphragm and a specialized set of intercostal muscles in between the ribs help in the generation of such pressure gradients for breathing.
How many of the following statements are correct?
Arrange the following steps of respiration, in the correct sequence and choose the right option.
i) Transport of gases by blood.
ii) Diffusion of O2 and CO2 across alveolar membrane.
iii) Diffusion of O2 and CO2 between blood and tissues.
iv) Inspiration and expiration.
v) Utilisation of O2 by the cells for catabolic reactions and release of CO2 into the blood capillaries.
| Column-I | Column-II | ||
| (A) | Tidal volume | (i) | 2500 to 3000 ml |
| (B) | IRV | (ii) | 1000 to 1100 ml |
| (C) | ERV | (iii) | 500 ml |
| (D) | RV | (iv) | 3400 to 4800 ml |
| (E) | VC | (v) | 1100 to 1200 ml |
