Expiration involves
A. Relaxation of diaphragm and intercostal muscles
B. Contraction of diaphragm and intercostal muscles
C. Contraction of diaphragm muscles
D. Contraction of intercostal muscles
Answer:A
Expiration involves
A. Relaxation of diaphragm and intercostal muscles B. Contraction of diaphragm and intercostal muscles C. Contraction of diaphragm muscles D. Contraction of intercostal muscles