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Q13(a):
Distinguish between (a) IRV and ERV
Solution :
Definition and Theoretical Framework
The distinction between Inspiratory Reserve Volume (IRV) and Expiratory Reserve Volume (ERV) is fundamental to understanding pulmonary ventilation and respiratory efficiency. These volumes are components of the lung capacities that define the functional limits of human respiration [Per the principles of Spirometry].
| Feature | Inspiratory Reserve Volume (IRV) | Expiratory Reserve Volume (ERV) |
|---|---|---|
| Definition | Additional volume of air that can be inspired by a forcible inspiration. | Additional volume of air that can be expired by a forcible expiration. |
| Measurement | Measured after a normal tidal inspiration. | Measured after a normal tidal expiration. |
| Average Value | $2500\text{ mL to }3000\text{ mL}$ | $1000\text{ mL to }1100\text{ mL}$ |
| Muscular Involvement | Involves forceful contraction of diaphragm and external intercostal muscles. | Involves forceful contraction of internal intercostal muscles and abdominal muscles. |
Step 1: Analyzing Inspiratory Reserve Volume (IRV)
IRV represents the "buffer" of air available for deep inhalation. Physiologically, it is the difference between the Inspiratory Capacity (IC) and the Tidal Volume (TV).
Mathematically expressed as:
$IRV = IC - TV$ [Where $IC$ is the maximum volume of air an individual can inhale after a normal expiration].
During physical exertion, the demand for oxygen increases, and the lungs recruit the IRV to expand the alveoli beyond their resting state.
Step 2: Analyzing Expiratory Reserve Volume (ERV)
ERV represents the "buffer" of air that can be forced out of the lungs after the lungs reach the equilibrium state of a normal, quiet breath. This volume remains in the lungs during normal breathing but can be mobilized under stress or specific respiratory maneuvers [Per the mechanics of forced expiration].
Visual Representation of Respiratory Volumes
Comparative Logical Summary
- Mechanical Force: IRV relies on the active expansion of the thoracic cavity, while ERV relies on the active compression of the thoracic cavity [Per Boyle's Law, as volume decreases, pressure increases to force air out].
- Clinical Significance: A decrease in IRV often indicates restrictive lung diseases (e.g., fibrosis), where the lung compliance is reduced. A change in ERV is often analyzed in patients with obstructive airway diseases where the elastic recoil of the lungs is compromised.
Final Solution: IRV is the supplemental volume of air that can be inhaled forcibly beyond the tidal volume (approx. 2500–3000 mL), whereas ERV is the supplemental volume of air that can be exhaled forcibly beyond the tidal volume (approx. 1000–1100 mL).
More Questions from Class 11 Biology Breathing and Exchange of Gases EXERCISES
- Q1: Define vital capacity. What is its significance?
- Q2: State the volume of air remaining in the lungs after a normal breathing.
- Q3: Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system. Why?
- Q4: What are the major transport mechanisms for $CO_2$? Explain.
- Q5: What will be the $pO_2$ and $pCO_2$ in the atmospheric air compared to those in the alveolar air ?
- Q6: Explain the process of inspiration under normal conditions.
- Q7: How is respiration regulated?
- Q8: What is the effect of $pCO_2$ on oxygen transport?
- Q9: What happens to the respiratory process in a man going up a hill?
- Q10: What is the site of gaseous exchange in an insect?
- Q11: Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern?
- Q12: Have you heard about hypoxia? Try to gather information about it, and discuss with your friends.
- Q13(b): Distinguish between (b) Inspiratory capacity and Expiratory capacity.
- Q13(c): Distinguish between (c) Vital capacity and Total lung capacity.
- Q14: What is Tidal volume? Find out the Tidal volume (approximate value) for a healthy human in an hour.
CBSE Solutions for Class 11 Biology Breathing and Exchange of Gases
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Mineral Nutrition
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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