Pyq- Human Physiology-Breathing & Exchange Of Gases

2018: Emphysema is a disease in which alveoli are destroyed. Tidal volume is the volume of air that a person can breathe in and out during normal breathing. When alveoli are destroyed, the surface area for gaseous exchange decreases. As a result, the tidal volume decreases.

2019: The correct answer is (C). Trachea is a tube that carries air from the larynx to the bronchi. It is not involved in gaseous exchange.

2020: The correct answer is (B). Females have more red blood cells than males. Red blood cells contain hemoglobin, which is the oxygen carrier in blood. As a result, the oxygen carrying capacity of blood is more in females than in males.