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प्रश्न
Explain the mechanism of breathing.
थोडक्यात उत्तर
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उत्तर
- The process of taking air into the lungs is called inspiration or inhalation.
- During inspiration, the sternum is pushed up and outward and the diaphragm is pulled down.
- This increases the volume of the thoracic cavity and the pressure decreases.
- The air outside the body flows into the lungs. Here exchange of gases takes place between the air and the blood.
- The process of expelling air from the lungs is called expiration or exhalation. Upon exhalation, the lungs recoil to force the air out of the lungs.
- The intercostal muscles relax, returning the chest wall to its original position. During exhalation, the diaphragm also relaxes, moving higher into the thoracic cavity.
- This increases the pressure within the thoracic cavity relative to the environment.
- Air rushes out of the lungs due to the pressure gradient. This movement of air out of the lungs is a passive event.
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पाठ 18: Organisation of Life - Exercises [पृष्ठ २१६]
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संबंधित प्रश्न
Write true or false for the following statement. Rewrite the false statement correctly.
Respiration and breathing are two different processes.
Define Hamburger’s phenomenon. Add a note on it.
During inspiration, the diaphragm ______.
The impulse for voluntary muscles for forced breathing starts in ____________.
Observe the figures given in Figures 10.3 (A) and (B) and answer the following.
In the figure label the arrows and indicate the direction of
- movement of air
- movement of the diaphragm
- movement of ribs
In breathing movements, air volume can be estimated by ______.
In alveolar air, the partial pressure of CO2 is ______.
In Hamburger’s phenomenon, ______.
Describe the steps in breathing.
Give function of carbonic anhydrase.
