... as the diseases themselves The Common Diseases and Disorders for the Blood System section of this chapter outlines the most common of these diseases, their signs and symptoms, as well as their ... bleeding First the blood vessel spasms, then a platelet plug forms, and lastly, the blood coagulates forming a blood clot 27- 23 ABO Blood Types • Blood types are distinguished by antigens and antibodies ... AB, and O; including in the discussion which blood types are compatible 27- 3 Learning Outcomes (cont.) 27. 4 Explain the difference between Rhblood and Rh-negative blood positive 27. 5 Describe the...