Ventrally and laterally,the thoracic chamber is formed by

The epithelium of the bronchioles is composed of which type of cells?

The lungs contain a large number of narrow tubes known as:

The figure shows a diagrammatic view of the human respiratory system with labels $A, B, C$,and $D$. Select the option which gives the correct identification and main function and/or characteristic.

The respiratory system is derived from which germ layer?

Besides mammals,diaphragm also occurs in