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.
1 The upper respiratory tract includes the mouth, nose, throat, larynx (voice box), and trachea (windpipe). 2  Upper respiratory infections are often referred to as  colds 3  .. The lower respiratory tract includes the bronchial tubes and the lungs.4  Bronchitis and pneumonia are infections of the lower respiratory tract. The upper respiratory tract includes the mouth, nose, throat, larynx (voice box), and trachea (windpipe). 2  Upper respiratory infections are often referred to as  colds 3  .. The lower respiratory tract includes the bronchial tubes and the lungs.