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Arrange the given steps by which the pulmonary volume increases in the sequence of events occurring first

I. Contraction of intercostal muscles

II. Lifting up of the ribs

III. Sternum causing an increase in the volume of the thoracic chamber in dorsoventral axis

IV. Contraction of the diaphragm which increases the volume of the thoracic chamber in antero-posterior axis

Choose the correct option

a)

I  II  III  IV

b)

IV  I  II  III

c)

IV  I  III  II

d)

I  III  IV  II



Question ID - 2745 | SaraNextGen Top Answer

Arrange the given steps by which the pulmonary volume increases in the sequence of events occurring first

I. Contraction of intercostal muscles

II. Lifting up of the ribs

III. Sternum causing an increase in the volume of the thoracic chamber in dorsoventral axis

IV. Contraction of the diaphragm which increases the volume of the thoracic chamber in antero-posterior axis

Choose the correct option

a)

I  II  III  IV

b)

IV  I  II  III

c)

IV  I  III  II

d)

I  III  IV  II

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

Pulmonary volume increases by the following steps

(i) Contraction of the diaphragm

(ii) Contraction of intercostal muscle

(iii) Lifting of the ribs

(iv) Sternum causing an increase in the volume of thoracic chamber in dorso ventral axis

127 votes


127