A mule is the result of a horse that has been bred with a donkey. Mules are generally sterile, meaning that they cannot be bred with each other in most cases. They also have 63 chromosomes. In appearance, mules may look very similar to donkeys. They also have stiff hair. Much like donkeys, mules are strong animals and tend to have calmer personalities.
To research the causes of Air embolism, consider researching the causes of these these diseases that may be similar, or associated with Air embolism: 1  Dyspnea. 2  Pulmaonary barotrauma. 3  Decompression syndrome. 4  Stroke. Thrombosis.
Pulmonary embolism - Causes. Causes of pulmonary embolism. A pulmonary embolism occurs when the artery that carries blood to the lungs becomes blocked. The blockage is usually a blood clot, but it can also be a fat droplet, an air bubble or amniotic fluid (fluid that surrounds unborn babies).