Chapter 12

A recording of the electrical events in the heart is a(n) A) ECG. B) MRI. C) coronary ischemia. D) digital subtraction angiography. E) angioplasm.

A) ECG.

The pacemaker of the heart is normally the A) SA node. B) AV node. C) AV bundle. D) Purkinje fibers.

A) SA node.

Contraction of the upper chambers of the heart is called A) atrial systole. B) atrial diastole. C) ventricular systole. D) ventricular diastole.

A) atrial systole.

The first "lubb" heart sound is associated with A) atrioventricular valves closing. B) atrioventricular valves opening. C) semilunar valves closing. D) semilunar valves opening.

A) atrioventricular valves closing.

A common technique to improve blood flow and remove plaque in coronary vessels is A) balloon angioplasty and stent placement. B) pharmaceutical plaque removal. C) angiography. D) MRI. E) bioprosthetic valve replacement.

A) balloon angioplasty and stent placement.

The pressure needed to force blood through all of the peripheral capillaries is A) capillary hydrostatic pressure. B) aortic flow. C) stroke volume. D) venous return. E) capillary exchange.

A) capillary hydrostatic pressure.

As vessels become smaller, peripheral resistance A) increases. B) decreases. C) stays unchanged.

A) increases.

When the ventricles contract, the semilunar valves are ________ and the atrioventricular valves are ________. A) open, closed B) open, open C) closed, closed D) closed, open

A) open, closed

The circuit that begins at the right ventricle and ends at the left atrium is the ________ circuit. A) pulmonary B) arteriole C) systemic D) venous E) hepatic

A) pulmonary

The circuit that carries deoxygenated blood to the lungs is the ________ circuit. A) pulmonary B) arteriole C) systemic D) venous E) hepatic

A) pulmonary

The blood vessels that carry blood to and from the lungs comprise the A) pulmonary circuit. B) systemic circuit. C) arteries. D) capillary bed. E) afferent circuit.

A) pulmonary circuit.

The bone lying anterior to the heart is the A) sternum. B) clavicle. C) scapula. D) os coxa. E) humerus.

A) sternum.

The right atrium receives blood from the A) superior and inferior vena cava. B) right and left pulmonary veins. C) right and left pulmonary arteries. D) aortic arch.

A) superior and inferior vena cava

An accelerated heart rate above 100 beats per minute is called A) tachycardia. B) brachycardia. C) resting heart rate. D) QRS complex. E) parasympathetic.

A) tachycardia.

The amount of blood arriving at the right ventricle each minute is A) venous return. B) venous pressure. C) cardiac output. D) peripheral resistance. E) capillary exchange.

A) venous return.

If the normal pacemaker of the heart fails, the job will be taken over by the A) SA node. B) AV node. C) AV bundle. D) Purkinje fibers.

B) AV node.

The right atrium receives A) oxygenated blood from the vena cava. B) deoxygenated blood from the vena cava. C) oxygenated blood from the pulmonary vein. D) deoxygenated blood from the pulmonary vein. E) oxygenated blood from the pulmonary artery.

B) deoxygenated blood from the vena cava.

The veins of the systemic circuit carry A) oxygenated blood to the heart. B) deoxygenated blood to the heart. C) oxygenated blood from the heart. D) deoxygenated blood from the heart.

B) deoxygenated blood to the heart.

The embryonic remains of the connection between atria is the A) foramen ovale. B) fossa ovalis. C) atrioventricular valve. D) interatrial septum. E) interventricular septum.

B) fossa ovalis.

The thickest layer of the heart is the A) endocardium. B) myocardium. C) epicardium. D) parietal pericardium. E) visceral pericardium.

B) myocardium.

The fluid lubricating the opposing surfaces of membrane in the pericardial cavity is called A) visceral fluid. B) pericardial fluid. C) mucous. D) cerumen. E) saline.

B) pericardial fluid.

Which of the following structures is NOT contained in the mediastinum? A) thymus B) thyroid C) trachea D) esophagus E) heart

B) thyroid

The right atrioventricular valve is the A) bicuspid. B) tricuspid. C) aortic semilunar valve. D) pulmonary semilunar valve.

B) tricuspid.

A typical bioprosthetic valve will provide service for approximately A) one year. B) five years. C) ten years. D) twenty years. E) a full lifetime.

C) Ten years

When the cardiac cycle begins, the A) atrioventricular and semilunar valves are both open. B) atrioventricular and semilunar valves are both closed. C) atrioventricular valve is open and the semilunar valves are closed. D) atrioventricular valve is closed and the semilunar valves are open.

C) atrioventricular valve is open and the semilunar valves are closed.

Expandable extensions of the atrium are called A) ventricles. B) sulci. C) auricles. D) ligamentum arteriosum. E) superatria.

C) auricles.

The vessels that supply blood to the heart are called the A) aortic arch. B) ascending aorta. C) coronary arteries. D) vena cava. E) coronary sinus.

C) coronary arteries.

The best description of the heart is that it is A) a single pump. B) two alternating pumps. C) four paired pumps. D) six paired pumps. E) four alternating pumps.

C) four paired pumps.

Cardiac output depends on A) stroke volume only. B) heart rate only. C) stroke volume and heart rate. D) blood pressure. E) peripheral resistance.

C) stroke volume and heart rate.

The circuit that travels through the left side of the heart is the ________ circuit. A) pulmonary B) arteriole C) systemic D) venous E) hepatic

C) systemic

The arteries of the pulmonary circuit carry A) oxygenated blood to the heart. B) deoxygenated blood to the heart. C) oxygenated blood from the heart. D) deoxygenated blood from the heart.

D) deoxygenated blood from the heart.

The fibrous remnants of the fetal connection between the aorta and the pulmonary trunk is called the A) coronary sulcus. B) anterior atrioventricular sulcus. C) auricles. D) ligamentum arteriosum. E) superatria.

D) ligamentum arteriosum

The T wave of an ECG corresponds to A) atrial systole. B) atrial diastole. C) ventricular systole. D) ventricular diastole.

D) ventricular diastole.

When the heart rate is 70 beats per minute and the stroke volume is 80 mL, what is cardiac output? A) 1500 mL/min B) 150 mL/min C) 56 mL/min D) 560 mL/min E) 5600 mL/min.

E) 5600 mL/min.

The left atrium and ventricle are supplied blood by the ________ artery. A) right coronary B) circumflex C) posterior interventricular D) marginal E) left coronary

E) left coronary

During heavy exercise cardiac output increases approximately ________ and skeletal muscle blood flow increases ________. A) two-fold, two-fold B) two-fold, three-fold C) three-fold, five-fold D) five-fold, ten-fold E) three-fold, ten-fold

E) three-fold, ten-fold

The serous membrane covering the heart is the A) endocardium. B) myocardium. C) endothelium D) parietal pericardium. E) visceral pericardium.

E) visceral pericardium.

A midsagittal section through the trunk would divide the heart A) equally into two halves. B) unequally, with most lying on the right side. C) unequally, with most lying on the left side. D) unequally, with most lying superior.

C) unequally, with most lying on the left side.