A sheep has so much fat around it's heart to protect the valves in  the heart. There is also a lot of fat there to maintain the body  temperature of the heart.
Definition and Causes. Upper respiratory tract infection (URI) is a nonspecific term used to describe acute infections involving the nose, paranasal sinuses, pharynx, larynx, trachea, and bronchi.The prototype is the illness known as the common cold, which is discussed here, in addition to pharyngitis, sinusitis, and tracheobronchitis.efinition and Causes. Upper respiratory tract infection (URI) is a nonspecific term used to describe acute infections involving the nose, paranasal sinuses, pharynx, larynx, trachea, and bronchi.
Upper respiratory infection facts. 1  Upper respiratory infections are one of the most common reasons for doctor visits. 2  Upper respiratory infections are the most common illness resulting in missed work or school. 3  Upper respiratory infections can happen at any time, but are most common in the fall and winter. Upper respiratory infections can happen at any time, but are most common in the fall and winter. 2  The vast majority of upper respiratory infections are caused by viruses and are self-limited. 3  Symptoms of upper respiratory infection include. 4  cough, 5  sneezing,