19. Which of the following sequences is correct to initiate
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

Choose options :-

(a) (i), (ii), (iv), (v), (iii), (vi)
(b) (i), (ii), (iii), (iv), (vi), (v)
(c) (i), (ii), (iv), (vi), (ii), (v)
(d) (vi), (v), (i), (ii), (iii), (iv)​