According to the uses of both horse and donkey, there are some similarities as well as dissimilarities. Both of them were wild once and then some became domesticated. Presently, most of the donkeys and horses are domesticated while still there are some wild populations.
In the breathing system, the air enters at the nostrils (nares) , passes through the nasal cavity (where some smell detectors are located) , and enters the trachea. Sid â¦ e branches of this system the Eustachian tubes communicate with the middle ear to allow for the balancing or air pressure across the eardrum.
Air pressure in the chest cavity and lungs is reduced, and because gas flows from high pressure to low, air from the environment flows through the nose or mouth into the lungs. As we exhale, the diaphragm moves upward and the chest wall muscles relax, causing the chest cavity to contract. Air pressure in the lungs rises, so air flows from the lungs and up and out of respiratory system through the nose or mouth.