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Respiratory Volumes & Capacity Video Lecture | Biology A-Level - A Level

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FAQs on Respiratory Volumes & Capacity Video Lecture - Biology A-Level - A Level

1. What are the different respiratory volumes and capacities?
Ans. The different respiratory volumes and capacities include tidal volume, inspiratory reserve volume, expiratory reserve volume, residual volume, inspiratory capacity, functional residual capacity, vital capacity, and total lung capacity. Each of these measures the amount of air involved in different stages of the respiratory cycle.
2. How is tidal volume different from inspiratory reserve volume?
Ans. Tidal volume refers to the volume of air inhaled and exhaled during normal breathing, while inspiratory reserve volume is the additional volume of air that can be inhaled after a normal inhalation. In other words, tidal volume represents the amount of air involved in regular breathing, while inspiratory reserve volume indicates the extra amount of air that can be inhaled if needed.
3. What is the significance of functional residual capacity?
Ans. Functional residual capacity (FRC) is the volume of air remaining in the lungs after a normal exhalation. It allows for a constant exchange of oxygen and carbon dioxide between the lungs and the blood. FRC plays a crucial role in maintaining respiratory efficiency and ensuring a continuous supply of oxygen to the body.
4. How is vital capacity calculated?
Ans. Vital capacity is the maximum volume of air that can be exhaled after a maximum inhalation. It is calculated by adding the tidal volume, inspiratory reserve volume, and expiratory reserve volume together. Vital capacity represents the total amount of air that can be moved in and out of the lungs during deep breathing.
5. Can residual volume be measured directly?
Ans. No, residual volume cannot be measured directly using spirometry. It is the volume of air that remains in the lungs even after a maximum exhalation. Since it cannot be exhaled completely, it cannot be measured through standard lung function tests. However, there are specialized techniques such as helium dilution and body plethysmography that can be used to estimate residual volume indirectly.
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