NEET 2025 Zoology Breathing and Exchange of Gases PDF

Breathing and Exchange of Gases Zoology Tapasya Questions By – Samapti Ma’am The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are : (1) pO2 = 104 and pCO2 = 40 (2) pO2 = 40 and pCO2 = 45 (3) pO2 = 95 and pCO2 = 40 (4) pO2 = 1...

Breathing and Exchange of Gases Zoology Tapasya Questions By – Samapti Ma’am The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are : (1) pO2 = 104 and pCO2 = 40 (2) pO2 = 40 and pCO2 = 45 (3) pO2 = 95 and pCO2 = 40 (4) pO2 = 159 and pCO2 = 0.3 Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli. (1) High pO2, low pCO2, less H+, lower temperature (2) Low pO2, high pCO2, more H+, higher temperature (3) High pO2, high pCO2, less H+, higher temperature (4) Low pO2, low pCO2, more H+, higher temperature NEET 2020 QUESTION Respiration through skin is called as; 1 branchial respiration. 2 cutaneous respiration. 3 pulmonary respiration. 4 tracheal respiration. QUESTION Which of the following is the site of actual diffusion of O2 and CO2 between blood and atmospheric air? 1 Exchange part 2 Conducting part 3 External nostrils 4 Terminal bronchioles QUESTION Epiglottis helps to; 1 produce sound. 2 reduces friction on the lung-surface. 3 prevent the entry of food into the larynx. 4 All of these QUESTION Which of the following causes an increase in the volume of the thoracic chamber in the dorso-ventral axis? 1 Contraction of external inter-costal muscles. 2 Relaxation of external inter-costal muscles. 3 Contraction of diaphragm. 4 Relaxation of diaphragm. QUESTION The thoracic chamber is formed dorsally by X, and ventrally by Y. What do X and Y represent here? 1 X- Sternum, Y- Vertebral column 2 X- Vertebral column, Y- Sternum 3 X- Diaphragm, Y- Ribs 4 X- Ribs, Y- Diaphragm QUESTION Arrange the steps in order and choose the correct option. I. Diffusion of gases between blood and tissues. II. Transport of gases by the blood. III. Diffusion of gases across alveolar membrane. IV. Utilisation of O2 by the cells for catabolic reactions. 1 IV→ III→ II→ I 2 IV→ II→ I→ III 3 III → II→ I→ IV 4 II→ I→ IV→ III QUESTION Read the following statements and identify ‘X’. I. ‘X’ humidifies the air to body temperature. II. ‘X’ clears it from foreign particles. 1 Conducting part 2 Alveoli 3 Alveolar ducts 4 Exchange part QUESTION Complete the analogy. Outer pleural membrane: Thoracic lining : : Inner pleural membrane: 1 Lung surface 2 Sternum 3 Diaphragm 4 Vertebral column QUESTION Which instrument helps in the clinical assessment of pulmonary volumes? 1 Sphygmomanometer 2 Stethoscope 3 Spirometer 4 Electrocardiograph QUESTION Spirometer can assess all of these lung volumes, except; 1 inspiratory reserve volume. 2 expiratory reserve volume. 3 residual volume. 4 tidal volume. QUESTION In the alveoli, which of the following factors is/are favourable for the formation of oxyhaemoglobin? I. High pO2 II. Low pCO2 III. Lesser H+ concentration IV. Lower temperature V. Low pH Choose the correct option. 1 Only (I) 2 (I), (II), (III) and (IV) 3 (I), (II) and (III) 4 All of these QUESTION The volume of air remaining in the lungs even after a normal expiration is called; 1 tidal volume (TV). 2 residual volume (RV). 3 functional residual capacity (FRC). 4 vital capacity (VC). QUESTION The process of normal inhalation is initiated by the contraction of which muscle? 1 Diaphragm 2 Intercostal muscles 3 Abdominal muscles 4 Both (1) and (2) QUESTION The partial pressure of CO2 is higher; 1 at alveolar level. 2 at tissue level. 3 in atmosphere. 4 in oxygenated blood. QUESTION Which enzyme converts carbon dioxide and water into carbonic acid in red blood cells? 1 Carbonic anhydrase 2 Catalase 3 Amylase 4 Lipase QUESTION What is the approximate partial pressure of oxygen (pO2) in systemic arteries? 1 40 mmHg 2 45 mmHg 3 80 mmHg 4 95 mmHg QUESTION In humans, the total thickness of the diffusion membrane is; 1 much more than a centimetre. 2 much less than a millimetre. 3 equal to a millimetre. 4 equal to a centimetre. QUESTION The total lung capacity of an adult human is approximately; 1 500- 600ml. 2 1000- 1100ml. 3 1100- 1200ml. 4 4650- 5800ml. QUESTION Arrange the following in the order of increasing volume. (A) Tidal volume (B) Residual volume (C) Inspiratory reserve volume (D) Vital capacity 1 A