1 The bitch has been pushing hard for an hour with no results. 2  A puppy presents rear end first and the head is too large to clear the pelvic bones.  There has been more than two hours between births, but you can still feel puppies inside.
Bronchus / Bronchi / Bronchioles. The airways of the lungs. When a person takes in a breath of air, the air travels through the nose or mouth, into the larynx, then into the trachea, which is the main passageway into the lungs. The trachea divides into a right and left main bronchus.
The bronchial tree provides a system for the trachea to service the lungs. It is important to note, however, that like the trachea, it does not include the lungs. The bronchial tree begins with the primary bronchi and ends with the alveoli. Inhaled corticosteroids help control narrowing and inflammation in the bronchial tubes. An accumulation of fluid in the alveoli may occur as a result of pneumonia. The trachea plays a vital part in transporting oxygen and carbon dioxide.