16 public questions tagged with this topic.
Inspiratory Reserve Volume (IRV) is the additional amount of air a person can inhale after a normal inspiration.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
During inspiration, alveolar pressure decreases below atmospheric pressure, allowing air to enter the lungs.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Vital capacity is the maximum amount of air a person can breathe in after a forced expiration. It includes Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV).
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 diaphragm relaxes and moves upward, decreasing thoracic volume and pushing air out.
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
Inspiratory Capacity (IC) includes Tidal Volume (TV) and Inspiratory Reserve Volume (IRV), representing the maximum volume of air a person can inspire after a normal expiration.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Inspiratory Capacity (IC) is the total volume of air a person can inspire after a normal expiration (TV + IRV).
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal expiration (ERV + RV).
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
During inspiration, the external intercostal muscles contract, lifting the ribs and increasing thoracic volume, facilitating air intake.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Residual Volume (RV) is the air that remains in the lungs even after a forceful expiration, preventing lung collapse.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Expiratory reserve volume refers to the additional air that can be exhaled after a normal expiration, making statement 3 correct.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
