HardZoologyBreathing and Exchange of Gases
+4 / -1
Which of the following helps in increasing the volume of the thoracic chamber?
A
Contraction of diaphragm
B
Contraction of external intercostal muscles
C
Relaxation of diaphragm
D
Both A and B
Explanation
Contraction of the diaphragm increases the vertical volume, while contraction of external intercostals lifts the ribs to increase the dorso-ventral volume.
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