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Name _________________________________ # _____ Pts. ____ /17 HEMOSTASIS Using the key choices, correctly complete the following description of the blood clotting process. Insert the term and the letter in the answer blanks. KEY CHOICES: A. Break B. Erythrocytes C. Fibrin D. Fibrinogen E. Platelets F. Prothrombin G. Serotonin H. Thrombin I. Thromboplastin Clotting begins when a __(1)__ occurs in a blood vessel wall. Almost immediately, __(2)__ cling to the blood vessel wall and release __(3)__, which helps to decrease blood loss by constricting the vessel. __(4)__ is also released by damaged cells in the area. This chemical substance causes __(5)__ to be converted to __(6)__. Once present, thrombin acts as an enzyme to attach __(7)__ molecules together to form long, threadlike strands of __(8)__, which then traps __(9)__ flowing by in the blood. 1. __________________ 4. __________________ 7. __________________ 2. __________________ 5. __________________ 8. __________________ 3. __________________ 6. __________________ 9. __________________ For each true statement, write T. If any statements are false, correct the underlined term by inserting the correction in the answer blank. ____________________________ Normally, blood clots within 5 – 10 minutes. ____________________________ The most important natural body anticoagulant is histamine. ____________________________ Hemostasis means stoppage of blood flow. ____________________________ An abnormally low number of platelets is a condition known as thrombopenia. ____________________________ An embolus occurs when a blood clot in an unbroken blood vessel releases and flows freely in the bloodstream. ____________________________ Erythropoietin is a hormone that is controlled by the lungs to register the oxygen levels in the blood. ____________________________ The “clotting cascade” is triggered by the release of Sodium which initiates the coagulation phase of hemostasis. ____________________________ Hemophilia is called the “Bleeder’s Disease.”