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प्रश्न
Explain the mechanism of breathing.
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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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संबंधित प्रश्न
Differentiate between cyclic and non-cyclic photophosphorylation.
Describe non-cyclic photophosphorylation with schematic representation. Give its significance.
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Choose the correct alternative.
_______ muscles contract when the external intercostal muscles contract.
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Identify the role of NAD+ in cellular respiration
Blood contains C02 in the form of ____________.
CO2 carried from the tissue cells in the blood is in the form of ______.
Observe the figures given in figure (A) and (B) and answer the following.
- Which of the figures A or B indicates the process of inhalation and which the process of exhalation?
- In the figure label the arrows and indicate the direction of
- movement of air
- movement of diaphragm
- movement of ribs
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because ______.
