Read the following statements and choose the correct option:
Statement I: The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere.
Statement II: Expiration occurs when the intrapulmonary pressure is higher than the atmospheric pressure.
Important Questions on Breathing and Respiration
Match the following columns and select the correct option:-
| Column-I | Column-II | ||
| (a) | Pneumotaxic centre | (i) | Alveoli |
| (b) | O2 Dissociation curve | (ii) | Pons region of the brain |
| (c) | Carbonic anhydrase | (iii) | Haemoglobin |
| (d) | Primary site of exchange of gases | (iv) | RBC |
Fill in the blanks with correct options:
The volume of thoracic chamber in antero-posterior axis is increased by contraction of ___I___.
The ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorsoventral axis is lifted up by contraction of ___II___.
| I | II | |
| (1) | Diaphragm | Internal intercostal muscle |
| (2) | Diaphragm | External intercostal muscle |
| (3) | External intercostal muscle |
Phrenic muscles |
| (4) | Abdominal muscles | Diaphragm |
(i) The amount of oxygen transported by one gram of haemoglobin is mL.
(ii) A molecule of haemoglobin carries four oxygen molecules.
(iii) The globin component of haemoglobin has iron to carry oxygen.
(iv) The partial pressure of oxygen in the inhaled air is mmHg.
Which of the above statements are incorrect?
Read the following statements:
(i) Nearly of is transported as carbaminohaemoglobin in RBCs.
(ii) Nearly of is transported as oxyhaemoglobin in RBCs.
(iii) Every of oxygenated blood delivers of to tissues during strenuous exercise.
(iv) With increase in body temperature during exercise, the affinity of haemoglobin for oxygen increases.
Which of the above statements are correct?
