Guard cell movement furnishes an example of

Which muscles are involved during forced breathing?

Explain the process of inspiration under normal conditions.

What is the difference between pulmonary respiration in frogs and human respiration?

An $A$ in the pulmonary volume $B$ the intra-pulmonary pressure to less than the atmospheric pressure which forces the air from $C$ to move into the lungs,i.e.,$D$. Choose the correct options for the blanks $A, B, C$ and $D$ to complete the above statement with reference to $NCERT$ textbook.

During expiration,the diaphragm becomes