CH. 20 Reading Quiz

The wall of the left ventricle is thicker than that of the right and the left ventricle pumps more blood than the right. Are these two statements true or false? a) both statements are true b) both statements are false c) the first is true; the second is false d) the first is false, the second is true

c) the first is true; the second is false

Which of the following correctly lists the order of events in the conducting pathway? a) AV node, internodal pathway, SA node, AV bundle, bundle branches, Purkinje fibers b) SA node, internodal pathway, AV node, AV bundle, bundle branches c) SA node, internodal pathway, AV node, AV bundle, bundle branches, Purkinje fibers d) SA node, AV node, internodal pathway, AV bundle, bundle branches, Purkinje fibers

c) SA node, internodal pathway, AV node, AV bundle, bundle branches, Purkinje fibers

The ____________ follows the coronary sulcus around the heart and supplies blood to the left atrium and ventricle. a) left coronary artery b) right coronary artery c) circumflex artery d) anterior interventricular artery

c) circumflex artery

The first heart sound, "lubb," is caused by the ________. a) closing of the semilunar valves b) regurgitation of the atrioventricular valves c) closing of the atrioventricular valves d) blood flowing into the ventricles

c) closing of the atrioventricular valves

Which of the following factors will decrease cardiac output? a) increased preload b) sympathetic activation c) stimulation of the vagus nerve d) increased venous return

c) stimulation of the vagus nerve

How is heart rate controlled? a) heart rate is controlled through the cardiac plexus b) parasympathetic and sympathetic divisions of the ANS control heart rate c) dual innervation controls the heart rate d) all the listed answers are correct

d) all the listed answers are correct

The amount of blood pumped by the left ventricle in one minute during the cardiac cycle is called the __________. a) end-systolic volume b) ejection fraction c) stroke volume d) cardiac output

d) cardiac output

The P wave of the electrocardiogram is closely followed by __________. a) relaxation of both atria b) contraction of both ventricles c) relaxation of the ventricles d) contraction of both atria

d) contraction of both atria

Which of the following will NOT increase the heart rate? a) increased levels of circulating epinephrine b) faster rise of the pacemaker potential c) increased sympathetic stimulation of the SA node d) increased parasympathetic stimulation of the SA node

d) increased parasympathetic stimulation of the SA node

The epicardium is also known as the __________. a) endocardium b) parietal pericardium c) myocardium d) visceral pericardium

d) visceral pericardium

The __________ valve prevents backward flow of blood into the left ventricle. a) aortic b) pulmonary c) bicuspid d) tricuspid

a) aortic

On an ECG, what phase of the cardiac cycle is masked by the QRS complex? a) atrial repolarization b) ventricular depolarization c) atrial depolarization d) ventricular repolarization

a) atrial repolarization

Blood flowing in the vena cava will next enter the __________. a) right atrium b) left ventricle c) left atrium d) right ventricle

a) right atrium

Which of the following statements is true about the SA (sinoatrial) node? a) the rate of spontaneous depolarization of nodal cells is the fastest in the SA node b) pacemaker cells in the Sa node form a pathway between the SA and AV nodes c) the pacemaker cells, which establish the heart rate, are located only in the SA node d) the action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles

a) the rate spontaneous depolarization of nodal cells is the fastest in the SA node

Passive refilling of the heart occurs during which phase of the cardiac cycle? a) ventricular diastole b) ventricular systole c) atrial diastole d) isovolumetric contraction

a) ventricular diastole

If you know both the heart rate and stroke volume, you can calculate the __________. a) ejection fraction b) cardiac output c) end-systolic volume d) end-diastolic volume

b) cardiac output

During ventricular systole, the blood pressure __________ and ventricular volume __________. a) decreases; increases b) increases; decreases c) decreases; decreases d) increases; increases

b) increases; decreases

Blood returning to the heart from the pulmonary circuit first enters the __________. a) right atrium b) left atrium c) pulmonary trunk d) pulmonary valve

b) left atrium

The pulmonary veins carry __________ blood to the __________ atrium. a) oxygenated; right b) oxygenated; left c) deoxygenated; left d) deoxygenated; right

b) oxygenated; left

The papillary muscles function to __________. a) close the AV valves b) prevent the AV valves from inverting into the atria c) eject blood from the ventricles d) push blood from the atria into the ventricles

b) prevent the AV valves from inverting into the atria

Which of these statements concerning the cardiac cycle is FALSE? a) aortic pressure is greater than pulmonary trunk pressure b) ventricular systole begins at the peak of atrial systole c) cardiac cycle begins with atrial systole d) AV valves close before semilunar valves open

b) ventricular systole begins at the peak of atrial systole