(a) (i) Rib cage/ chest cavity
(ii) Diaphragm
(b) Lungs inflate or expand i.e. balloons are inflated
(c) The volume of D increases and pressure decreases when you pull down the string. External atmospheric pressure being higher forces air to enter the balloons and they inflate
johnmulu answered the question on May 4, 2017 at 05:37
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