Question

Which of the following sequence is correct to initiate
expiration?
1. Relaxation of diaphragm and external intercostal muscles and return of diaphragm and sternum to their normal position
2. Air expelled from lungs
3. Volume of thorax decreases
4. Intrapulmonary pressure increases
о O
1, 3, 4, 2
O
2,4,3,1
4, 3, 2, 1
1, 2, 3, 4​

Answer 1

The correct sequence of events in the initiation of respiration is:

(i) The contraction of external intercostal muscles raises the ribs and sternum

(ii) The volume of thorax increases in the dorsoventral axis

(iv) Diaphragm contraction

(vi) The volume of thorax increases in the anterior-posterior axis

(iii) Intrapulmonary pressure decreases

(v) Air rushes into lungs

Hope this helps!!

Answer 2

Answer:

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