Subject :NSO Class : Class 3
The organ system in your body that is responsible for changing the balloon from 'a' to 'b' as shown in the given figure is
![b-7.eps](https://www.sofolympiadtrainer.com/revisewise/questions/MTG_3_NSO_Chapter_7/mtg_3_nso_q7/b-7_opt.jpeg)
The organ system in your body that is responsible for changing the balloon from 'a' to 'b' as shown in the given figure is