How does a reptile breathe?

They are represented by saccular lungs with cellular walls (surface), penetrated with capillaries. The airways are represented by the nasal cavity, larynx, trachea, which is divided into two bronchi, lungs, bronchi do not branch in the lungs. Reptiles do not have cutaneous respiration, breathing with the help of the intercostal and pectoral muscles. One of the main aromorphoses of reptiles is the differentiation of the airways and the appearance of cellular lungs, and there is also a progressive development of the nervous system and the emergence of intercostal muscles, due to which the type of respiration described above is possible.