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 respiratory tract refers to the pathway that carries air to the lungs, and can be divided into upper and lower parts. The lower respiratory tract consists of the lungs and windpipe, while the upper respiratory tract includes the nose, sinuses, throat (pharynx) and voice box (larynx). Although sinusitis, laryngitis and strep throat are all infections of the upper respiratory tract, the term URI usually refers to acute viral rhinitis. Another name for this condition is the âcommon cold.â. The symptoms of a viral URI typically include nasal congestion, sneezing, and a runny nose with clear mucus.