7 public questions tagged with this topic.
During inspiration, the diaphragm contracts and moves downward, increasing the thoracic cavity volume.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Expiration occurs when intrapulmonary pressure is higher than atmospheric pressure, forcing air out of the lungs.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
The larynx contains the epiglottis, which prevents food from entering the trachea during swallowing.
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
During inspiration, the diaphragm contracts and moves downward, increasing thoracic volume and reducing pressure, allowing air to enter the lungs.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
Inspiration occurs when intrapulmonary pressure is less than atmospheric pressure, allowing air to flow into the lungs. Therefore, statement 3 is incorrect.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
The trachea divides into right and left primary bronchi at the level of the 5th thoracic vertebra, making this statement correct.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
