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.
The most familiar upper respiratory infections include the common cold (rhinopharyngitis), infection of the throat (pharyngitis), tonsils (tonsillitis), the maxillary sinuses behind the nose (sinusitis), and the larynx (laryngitis). Ear infections (acute otitis media) are another manifestation of URI.he most familiar upper respiratory infections include the common cold (rhinopharyngitis), infection of the throat (pharyngitis), tonsils (tonsillitis), the maxillary sinuses behind the nose (sinusitis), and the larynx (laryngitis). Ear infections (acute otitis media) are another manifestation of URI.