Breathing and Exchange of Gases

The partial pressure of oxygen in alveoli is approximately:

Vital capacity of lungs is:

Oxygen dissociation curve is sigmoid for:

The major transport form of CO2 in blood is:

Residual volume of lungs is approximately:

In humans, respiration occurs in the following steps. Arrange these steps in the correct order. A. Diffusion of O2 and CO2 between blood and tissues, B. Diffusion of O2 and CO2 across alveolar membrane, C. Pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out, D. Cellular respiration, E. Transport of gases by the blood. ( NEET 2026)

Match List-I (Respiratory Volume) with List-II (Capacity in mL) — A. ERV, B. RV, C. IRV, D. TV — with I. 2500-3000 mL, II. 500 mL, III. 1000-1100 mL, IV. 1100-1200 mL ( NEET 2026)

Match List I with List II — A. Molluscs, B. Reptiles, C. Adult amphibians, D. Amoeba — with I. Pulmonary respiration only, II. Branchial respiration, III. Cellular respiration, IV. Pulmonary and cutaneous respiration ( NEET 2026)