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To generate pressure gradients to facili...

To generate pressure gradients to facilitate expiration and inspiration the human body uses the intercostal muscles and

A

alveolar air

B

bronchi

C

primart, secondary and tertiary bronchioles

D

diaphragm

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The correct Answer is:
D
During inspiration, the diaphragm and specicalised set of inercostal muscles ( external and internal) contract. This moves the lateral thoracic wall out ward and upward incresing capacity of thoracic cavity and generate the pressure gradient between the lungs and atmosphere. Expiration is a passive process.
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ARIHANT NEET-BREATHING AND EXCHANGE OF GASES -Chapter exercise C (Medical entrances gallery )
  1. what is the .(p)O(2) and .(p)CO(2) in the systemic arteries ?

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  2. Choose the wrong statement .

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  3. To generate pressure gradients to facilitate expiration and inspiratio...

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  4. the figure shows a diagrammatic view of human respiratory system with ...

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  5. Oxygen dissociation curve is

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  6. Haemoglobin is having maximum affinity with

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  7. During inspiration the diaphragm

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  8. The oxygen toxicity is related with

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  9. Skin is an accessory orgen of repiration in

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  10. When oxygen supply to tissues is inadequate, the condition

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  11. Large volume of air that a person can expire after a forceful inspirat...

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  12. People who have migrated from the planes to an area adjoining Rohtang ...

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  13. Which one of the following is the correct statement for respiration in...

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  14. After forceful inspiration, the amount of air that can be breathed out...

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  15. Amount of oxygen supplied by 100 ml arterial blood while passing throu...

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  16. the volume of ' anatomical dead space ' air is normally

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  17. Two friends are eating togeather on a dinning table. One of them sudde...

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  18. A large proportion of oxygen is left unused the human blood even after...

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  19. The figure given below shows a small part of human lung where exchange...

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  20. The factor which does not affect the rate of alveolar diffusion is

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