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.
Bronchi is plural. The primary right and left bronchi direct the air into the right and left lungs. It then splits to go to each l â¦ obe of the lung. These tubes are secondary or lobar bronchi.The next division is the bronchiole tree, the alveolar duct and the alveolar sacs or clusters.ronchi is plural. The primary right and left bronchi direct the air into the right and left lungs. It then splits to go to each l â¦ obe of the lung. These tubes are secondary or lobar bronchi.