Unformatted text preview: 21. Which valve prevents blood from ﬂowing back into the right ventricle when the
right ventricle relaxes?
22. What type of valves are the aortic and pulmonary valves?
23. What supplies blood to the myocardium?
Right and left coronary arteries 24. During which period of heart contraction are the atrioventricular valves closed?
Ventricular systole 25. During which period of heart contraction are the atria contracting?
Atrial systole 26. What is the order 1n which impulses travel through the heart?
Sinoatrial node atrioventricular node, bundle of His, Purkinje ﬁbers 27. The pacemaker of the heart is also called what?
Sinoatrial node 28. What effect does the sympathetic nervous system have on heart rate?
Heart rate increases 29. What is the purpose of a stent? . To keep a blocked blood vessel open 30. Myocardial 1nfarction 15 also known as?
Heart attack 31. What device 1s used to correct uncoordinated heart muscle contractions by
generating a strong electric current to the heart?
deﬁbrillator 32. What is atherosclerosis?
The deposition of plaque to cause thickening and hardening of vessels 33. Which blood vessels are the site for exchanges between systems such as blood
and body tissues?
capillaries 34. Which blood circuit are the capillaries in the lungs a part of?
The pulmonary circuit 35. Where do the carotid arteries supply blood to?
The head 36. Which vessels supply blood to the intestine?
mesenteric 37. The superﬁcial palmar arch is formed by the union of what two arteries?
Radial and ulnar arteries 38. Where would you ﬁnd the cephalic, basilica and median cubital veins?
The arm _ 39. A system in which blood ﬂows through a second capillary bed before heading
back to the heart is known as?
A portal system 40. What is the main process by which substances move between the cells and the
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- Spring '08