An agent that is smaller than a virus causes scrapie. It is either a protein called a prion or it is another substance closely associated with the prion protein. Scientists still have a lot to learn about the scrapie agent and exactly how it works.
Tissue valves are made with tissues from porcine (pig) heart valves or bovine (cow) cardiac tissue because they function like human heart valves. Once the tissue is removed from the animal, it is chemically treated to preserve the tissue and prevent immulogic reactions once it is placed in a patient.
Best Answer: Bladder tissue is made up of mostly transitional epithelium, with some dense irregular connective tissue to prevent overexpansion.Ureter tissues are made up of 3 tissue layers.They are the inner mucosa (transitional epithelium), middle muscular layer (smooth muscle tissue), and adventitia (outer connective tissue). I'm getting this from my anatomy book, and the authors don't specify the type of connective tissue in the adventitia.est Answer: Bladder tissue is made up of mostly transitional epithelium, with some dense irregular connective tissue to prevent overexpansion.