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Inspiration is initiated by the contract...

Inspiration is initiated by the contraction of

A

External intercostal muscles .

B

Internal intercostal muscles

C

Diaphragm

D

Both A and B

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The correct Answer is:
C
 Inspiration is initiated by the contraction of diaphragm.Â
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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.

Which of the following sequenes is correct to intite inspiration ? (i) the contraction of external intercostal muscles raises the ribs and sternum (ii) Volume of thorax increases in the dorso-ventral axis (iii) intrapulmonary pressure decreases (iv) Diaphragm contraction (v) Air rushes into lungs (vi) Volume of thorax increases in the anterior-posterior axis

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Assertion: In cockroach, inspiration is an active process. Reason: It is due to the contraction oftergosternal muscle.

A2Z-BREATHING AND EXCHANGE OF GASES-Section A: Topicwise Questions Topic 2 : Mechanism Of Breathing (respiratory Volumes And Capacities)
  1. Ptessure within the lungs is called

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  2. Pressure gradient between the lungs and atmosphere is generated by ...

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  3. Inspiration is initiated by the contraction of

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  4. Contraction of diaphragm increases the volume of thoracic chamber in t...

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  5. The contraction of .......muscles lifts up the ribs and the sternum ca...

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  6. External and internal intercostal muscles are present in

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  7. Normal breathing rate of a healthy human is

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  8. In breathing movements, air volume can be estimated by

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  9. Additional volume of air, a person can expire by a forcible expiration...

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  10. Total volume of air a person can inspire after a normal expiration is ...

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  11. the amount of vloume of air that can be inspired / expired normally is...

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  12. The volume of air present in the lungs after forceful expiration is ca...

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  13. Volume of air that remain in the lungs after a normal expiration is ca...

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  14. Total volume of air a person can expire after a normal inspiration is ...

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  15. Total volume of air accommodated in the lungs at the end of a forced i...

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  16. Additional volume of air a person can inspire by a forcible inspiratio...

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  17. Match the columns I and II, and choose the correct combination from th...

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  18. Recognise the figure and find out the correct matching

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  19. Vital capacity, the maximum volume of air a person can inhale, is meas...

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  20. Muscles attached to diaphragm contract during inspiration to make it

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