Assertion (A): Inspiration under normal conditions is an active process.
Reason (R): It is initiated by the contraction of the diaphragm and external inter-costal muscles which increases the thoracic volume.
Assertion (A): Inspiration under normal conditions is an active process.
Reason (R): It is initiated by the contraction of the diaphragm and external inter-costal muscles which increases the thoracic volume.