The Heart Questions
Which of the following is TRUE of the coronary arteries? - They transport blood directly into the ascending aorta. - Blood pressure in these vessels is the lowest found anywhere in the systemic circuit. - They drain into the right atrium inferior to the opening of the inferior vena cava. - They originate at the base of the ascending aorta and are the first branches off this vessel. - Together they supply a small portion of the cardiac muscle with oxygen.
They originate at the base of the ascending aorta and are the first branches off this vessel.
There are many interconnections between the arterial branches of the coronary circulation, which function to maintain a constant blood supply to the muscle of the heart. These connections are called ________. - prolapse - anastomoses - syncytium - autorhythmicity - intercalation
anastomoses
The sinoatrial node, or cardiac pacemaker, is ________. - able to cause the cardiac muscle to begin to contract at the apex - embedded in the posterior wall of the right atrium, near the entrance of the superior vena cava - able to cause the atria and ventricles to contract simultaneously - electrically active nodal tissue located in the wall of the left ventricle - embedded in the anterior two-thirds of the interventricular septum
embedded in the posterior wall of the right atrium, near the entrance of the superior vena cava
In the pulmonary circuit, __________. - arteries carry deoxygenated blood to the lungs - body tissues receive oxygenated blood before the blood - - returns to the right atrium of the heart - arteries carry oxygenated blood to the lungs - veins carry deoxygenated blood to the lungs
arteries carry deoxygenated blood to the lungs
A complete heartbeat is referred to as a(n) ________.
cardiac cycle
The right ventricle ________. - receives blood from the left atrium through the right atrioventricular (tricuspid) valve - has thinner muscular walls than does the left ventricle - pumps blood out of the heart to the systemic circuit - is connected to the pulmonary veins - pumps blood out of the heart through the aortic valve
has thinner muscular walls than does the left ventricle
Damage to the mitral valve would allow the flow of blood into the __________. - right ventricle - left atrium - left ventricle - right atrium
left atrium
Which vessel gives rise to a circumflex branch and an anterior interventricular branch? - posterior descending artery - right coronary artery - left marginal branch - coronary sinus - left coronary artery
left coronary artery
Which chamber of the heart can generate the greatest pressure?
left ventricle
Valves of the heart open and close due to ________. - pressure changes - contraction of papillary muscles - electrical signals - timing sequences - None of the answers are correct.
pressure changes
Which portion of the conducting system directly stimulates the ventricles? - Purkinje fibers - internodal pathways - bundle branches - AV node
purkinje fibers
Which two chambers of the heart are connected by an opening during embryonic development that seals up at birth? - the left atrium and left ventricle - the right atrium and right ventricle - the right and left ventricles - the right and left atria
right and left atria
Plaque buildup in the left coronary artery (LCA) would NOT affect which portion of the heart? - right ventricle - left atrium - left ventricle - right atrium
right atrium
Which heart structure receives blood from the systemic circuit? - left ventricle - right ventricle - left atrium - pulmonary veins - right atrium
right atrium
The right border of the heart is supplied by the ________. - great cardiac vein - circumflex artery - posterior interventricular artery - anterior interventricular artery - right marginal artery
right marginal artery
A blockage in the pulmonary trunk would first affect which heart chamber with a buildup of blood? - right atrium - left ventricle - left atrium - right ventricle
right ventricle
The largest heart vein that returns deoxygenated blood from the arms to the right atrium is the __________. - aorta - superior vena cava - coronary sinus - inferior vena cava
superior vena cava
Blood that is moved to and from all of the tissues of the body (with the EXCEPTION of the lungs) is transported in the ________. - pulmonary circuit - arterial circle of Willis - hepatic portal circuit - systemic circuit - infundibular circuit
systemic circuit
During ventricular diastole ________. - the semilunar valves open and the AV valves close - only the AV valves close - the semilunar valves close and the AV valves open - only the AV valves open - only the semilunar valves close
the semilunar valves close and the AV valves open
What is the purpose of the chordae tendineae? - to prevent blood from flowing into the pulmonary trunk and aorta - to keep the atrioventricular valves open during atrial contraction - to keep the atrioventricular cusps from prolapse, preventing regurgitation - to prevent leakage of blood back into the ventricles through the semilunar valves
to keep the atrioventricular cusps from prolapse, preventing regurgitation
The ________ are a series of irregular muscular folds formed on the internal surface of the ventricles. - moderator bands - pectinate muscles - trabeculae carneae - papillary muscles - chordae tendineae
trabeculae carneae
