Chapter 6 The Circulatory System 12 KNOWLEDGE DRILL 6-3:TRUE/FALSE ACTIVITY The following statements are all false. Circle the one or two words that make the statement false, and write the correct word(s) that would make the statement true in the space provided. endocardium 1. The three layers of the heart are the epicardium, the myocardium, and the pericardium. 2. Cardiac contraction is initiated by an electrical impulse generated from the AV bundle also called the pacemaker. SA mode Arteries 3. Ceins are blood vessels that carry blood away from the heart. infarction 4. Myocardial ischemtas is defined as a heart attack or death of the heart muscle due to occlusion. 5. When Venous blood is collected by syringe, the pressure normally causes the blood to "pump" into the syringe. arterial 6. Venules are microscopic, one-cell-thick vessels that connect the arteries and arterioles. 7. The venous distribution patterns are so named because the major AC veins on the arm resemble the shape either an "H" or a "Y." 8. The AC fossa is the shallow depression in the arm that is inferior and above the bend of the elbow. 9. The "H-shaped" venous distribution pattern displayed by approximately 50% of the population includes th median cephalic vein, cephalic vein, and basilic vein. 10. The main function of RBCs is to destroy pathogens. 11. Blood that is removed from the body will clot within 10 to 15 minutes. The blood cells are enmeshed in a fibrin network, and the remaining fluid portion is called plasma. 12. Tests for lymphatic disorders include D-dimer, prothrombin time, and partial thromboplastin time. 13. The femoral artery is a major artery in the antecubital area. 14. Blood type A is the most common blood type. eBist 15. Thrombin is an elastic threadlike protein involved in clot formation.