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Inspiration can occur , when -...

Inspiration can occur , when -

A

Pressure within the lungs is less than the atmospheric pressure.

B

Pressure within the lungs is more than the atmospheric pressure.

C

Pressure within the lungs and atmospheric air is same.

D

No effect of pressure on inspiration

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Inspiration**: Inspiration refers to the process of breathing in air. It is essential for gas exchange in the body, allowing oxygen to enter the lungs. 2. **Pressure Gradient Concept**: Inspiration occurs due to the difference in pressure between the inside of the lungs and the outside atmosphere. This concept can be illustrated with a simple analogy of two buckets of water at different levels trying to reach equilibrium. 3. **Lung Mechanics**: When we inhale, the diaphragm and intercostal muscles contract, expanding the thoracic cavity. This expansion decreases the pressure inside the lungs. 4. **Pressure Comparison**: For air to flow into the lungs, the pressure inside the lungs must be lower than the atmospheric pressure outside. This creates a pressure gradient that allows air to move into the lungs. 5. **Conclusion**: Therefore, inspiration can occur when the pressure within the lungs is less than the atmospheric pressure. **Final Answer**: Inspiration can occur when the pressure within the lungs is less than the atmospheric pressure. ---
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Inspiration can occur if

Inspiration can occur if the intra-pulmonary pressure is ________A________ than the atmospheric pressure. Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the ________B_______ axis.

Knowledge Check

  • Fill up the blanks in the following paragraph by selecting the correct option. The movement of air into and out of the lungs is carried out by creating a (i).____ between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is (ii).____ Expiration takes place when the intra-pulmonary pressure is (iii).____ than the atmospheric pressure. Expiration takes place when the intra-inspiration is initiated by the (iv).____ of diaphragm which (v).____the volume of thoracic chamber in the antero-posterior axis.

    A
    `{:("(i)",(ii),(iii),(iv),(v)),("concentration gradient","less","higher","relaxation","increases"):}`
    B
    `{:("(i)",(ii),(iii),(iv),(v)),("concentration gradient","higher","less","contraction","decrease"):}`
    C
    `{:("(i)",(ii),(iii),(iv),(v)),("pressure gradient","higher","less","relaxation","decrease"):}`
    D
    `{:("(i)",(ii),(iii),(iv),(v)),("pressure gradient","less","higher","contraction","increase"):}`

  • Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. This negative pressure is achieved when

    A
    intrapulmonary pressure is less than the atmospheric pressure
    B
    Intrapulmonary pressure is greater than the atmospheric pressure
    C
    intrapulmonary pressure is equal to the atmospheric pressure
    D
    intrapleural pressure becomes more than the intra-alveolar pressure.

  • Asertiion : Inspirations occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure. Reason : During inspiration, a decrease in pulmonary volume increases the intre-pulmonary pressure than atmospheric pressure which forces the air from outside to moe into the lungs.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true and reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

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    Assertion :- Inspiration can occur if intra pulmonary pressure is less than the atmospheric pressure. Reason :- Inspiration is initiated by the relaxation of diaphragm and external intercostal muscle.

    Respiration can occur in the absence of oxygen in

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