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प्रश्न
Describe the steps in breathing.
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उत्तर
- Inspiration: During inspiration, the atmospheric air is taken into the lungs. It occurs due to the pressure gradient formed between the lungs and the atmosphere. It is an active process in which the diaphragm becomes flat and goes downward, the external intercostal muscles contract so the ribs and sternum move upward and outward. This leads to an increase in the thoracic volume and a decrease in the pressure of the thorax and the lungs. To equalize the low pressure inside the lungs, air from the atmosphere rushes into the lungs. This is an inspiration.
- Expiration: During expiration, the thorax contracts causing air to be exhaled. The diaphragm relaxes and is pushed upwards. It becomes dome-shaped. The intercostal muscles also relax pulling the rib cage inward and downward. This causes a decrease in thoracic volume and leads to an increase in pressure in the thorax and the lungs as compared to the atmospheric pressure. So air from the lungs rushes out. This is expiration.
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संबंधित प्रश्न
The size of the chest cavity increases during inhalation.
Distinguish between inspiration and expiration.
After a long deep breath, we do not respire for some seconds due to ______.
Make the correct pairs.
| Column – I | Column – II |
| (P) IC | i. maximum volume of air breathe in after forced. |
| (Q) EC | ii. Volume of air present after expiration in lungs. |
| (R) VC | iii. Volume of air inhaled after expiration. |
| (S) FRC | iv. Volume of air present after expiration in lungs. |
Identify the CORRECT statement.
Which of the following is CORRECT with reference to oxygen dissociation curve?
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In breathing movements, air volume can be estimated by ______.
The figure given below shows a small part of human lung where exchange of gas takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function.
Listed below are four respiratory capacities (1 - 4) and four jumbled respiratory volumes of a normal human adult
| Respiratory Capacities | Respiratory Volumes |
| 1. Residual volume | 2500 mL |
| 2. Vital capacity | 5500 mL |
| 3. Inspiratory sore volume | 1200 mL |
| 4. Total Lung capacity | 4500 mL |
Which one of the following is the correct matching of two capacities and volumes?
