9 public questions tagged with this topic.
Surfactant is a lipoprotein secreted by alveolar cells to reduce surface tension and prevent alveolar collapse.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Disorders - Asthma Emphysema Occupational Disorders
The conducting part of the respiratory system transports air, filters it, and humidifies it, but gas exchange occurs only in the alveoli.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Exchange of Gases and Transport of Oxygen
Spirometry is a clinical tool used to assess lung function by measuring various respiratory volumes.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Normal expiration is a passive process, not an active one. It occurs due to the relaxation of respiratory muscles.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
During expiration, the intercostal muscles relax, reducing thoracic volume and increasing pulmonary pressure, leading to air expulsion.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Inhalation occurs when intrapulmonary pressure falls below atmospheric pressure, allowing air to flow into the lungs.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
During expiration, the diaphragm relaxes and moves upward, decreasing thoracic volume and increasing pressure.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
Pleural fluid reduces friction and helps maintain lung expansion but does not directly facilitate gas exchange.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
