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Inspiration can occur when -...

Inspiration can occur when -

A

Intra pulmonary pressure (IPP) is less than atmospheric pressure.

B

IPP is more than atmospheric pressure

C

IPP is equal to atmospheric pressure

D

All of the above

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Inspiration**: Inspiration is the process of taking air into the lungs. It is essential for gas exchange, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled. 2. **Role of Pressure**: The key factor that allows inspiration to occur is the difference in pressure between the inside of the lungs (intrapulmonary pressure) and the outside atmosphere (atmospheric pressure). 3. **Intrapulmonary Pressure**: Intrapulmonary pressure refers to the pressure within the lungs. At rest, this pressure is typically around -4 mmHg relative to atmospheric pressure. 4. **Pressure Comparison**: For air to flow into the lungs during inspiration, the intrapulmonary pressure must be less than the atmospheric pressure. This creates a pressure gradient that allows air to move into the lungs. 5. **Correct Conditions for Inspiration**: - If intrapulmonary pressure is less than atmospheric pressure, air will flow into the lungs, making this condition necessary for inspiration. - If intrapulmonary pressure is greater than atmospheric pressure, air cannot enter the lungs, which is a condition associated with expiration (the process of exhaling). - If intrapulmonary pressure equals atmospheric pressure, there is no net movement of air, and thus, no inspiration occurs. 6. **Conclusion**: Therefore, inspiration can occur when the intrapulmonary pressure is less than the atmospheric pressure.
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