The apex of the heart lies___, pointing toward the __ lung A. Just below the clavicle; right B. On the diaphragm; left C. Just below the clavicle; left D. On the diaphragm; right

The bicuspid or mitral valve is the valve A. Between the left atrium and left ventricle B. That opens from the right ventricle into the artery C. Between the right atrium and right ventricle D. That opens from the left ventricle into the artery

The aortic semilunar valve is the valve A. Between the left atrium and left ventricle B. That opens from the right ventricle into the artery C. Between the right atrium and right ventricle D. That opens from the left ventricle into the artery

The pulmonary semilunar valve is the valve A. Between the left atrium and the left ventricle B. That opens from the right ventricle into the artery C. Between the right atrium and right ventricle D. That opens from the left ventricle into the artery

The tricuspid valve is the valve A. Between the left atrium and the left ventricle B. That opens from the right ventricle into the artery C. Between the right atrium and right ventricle D. That opens from the left ventricle into the artery

The first heart sound is caused by the closing of the ____ valve(s) A. Mitral B. Semilunar C. Tricuspid D. Both A and C

The second heart sound is caused by the closing of the ___ valve(s) A. Mitral B. Semilunar C. Tricuspid D. Both A and C

Another name for “hardening of the arteries” is A. Angina pectoral B. Myocardial infarction C. Atherosclerosis D. Embolism

Which structure is known as the “pacemaker” of the heart A. Purkinje fibers B. Sinoatrial node C. Atrioventricular node D. Bundle of his

Which component of the conduction system actually contracts the ventricles A. Purkinje fibers B.sinoatrial node C. Atrioventrricular node D. Bundle of his

The T wave in an electrocardiogram results from A. Depolarization of the ventricles B. Depolarization of the atria C. Repolarization of the ventricles D. Repolarization of the atria

The P wave in an electrocardiogram results from A. Depolarization of the ventricles B. Depolarization of the atria C. Repolarization of the ventricles D. Repolarization of the atria

The QRS complex in an electrocardiogram results from A. Depolarization of the ventricles B. Depolarization of the atria C. Repolarization of the ventricles D. Repolarization of the atria

A heart beat that is less than 60 beats per minute is called A. Tachycardia B. Bradycardia C. Sinus dysrhythmia D. Fibrillation

Which of the following is not a cause of heart failure A. Valve disorder B. Cardiomyopathy C. Cor pulmonale D. All of the above can cause heart failure

Which of the following is not true of atria A. They are the upper chambers of the heart B. They are called the discharging chambers C. They have thinner walls that the ventricles D. All of the above are true of the atria

Which of the following is not true of the ventricles A. They are the lower chambers of the heart B. They are called the discharging chambers of the heart C. They have thicker walls than the atria D. All of the above are true of the ventricles

Which of the following is not true of the pericardium A. The parietal pericardium is also called the epicardium B. The pericardium is made up of two layers of fibrous tissue C. The fluid between the two layers of the pericardium helps reduce the friction caused by the beating heart D. All of the above are true of the pericardium

Blood passing through the tricuspid valve has just left which heart chamber A. Left atrium B. Left ventricle C. Right atrium D. Right ventricle

Blood entering an artery has just left which heart chamber A. Left ventricle B. Left atrium C. Right ventricle D. Either A or C

Blood returning from the lung enters which heart chamber A. Left atrium B. Left ventricle C. Right ventricle D. Right atrium

Blood leaving the superior vena cava enters which heart chamber A. Left atrium B. Left ventricle C. Right ventricle D. Right atrium

The sequence of an impulse moving through the conduction system of the heart is A. Sinoatrial node, atrioventricular node, Purkinje fibers, bundle of his B. Atrioventricular node, Purkinje fibers, bundle of his, Sinoatrial node C. Sinoatrial node, atrioventricular node, bundle of his, Purkinje fibers D. Sinoatrial node, bundle of his, atrioventricular node, Purkinje fibers

Which Structure is NOT part of the heart’s valve system A. Aortic sinus B. Tricuspid annulus C. Mistrial annulus D. Pulmonary semilunar valve

Which statement about the atria is true? A. They produce the electrical impulses controlling ruthenium B. They are the main pumping chambers C. They pump blood to the lungs D. They receive blood returning to the heart

What chamber sends oxygen-rich blood into the aorta for systemic circulation A. Left atrium B. Right ventricle C. Right atrium D. Left ventricle

Which chamber receives oxygenated blood from the lungs A. Left atrium B. Right ventricle C. Left ventricle D. Right atrium

Which valve is located between the left atrium and left ventricle A. Tricuspid valve B. Aortic valve C. Mitral valve D. Pulmonary valve

Which of the following structures are specialized conducting fibers that quickly deliver impulses to the ventricles A. Purkinje fibers B. Myocardial cells C. Intercalated discs D. Chorionic fibers

Which vessels carry blood away from the heart to the lungs for gas exchange A. Aorta B. Systemic arteries C. Pulmonary arteries D. Pulmonary veins

Which heart valve prevents backflow from the left ventricle into the left atrium A. Aortic valve B. Pulmonary valve C. Tricuspid valve D. Mitral valve

Which blood vessel type directly returns blood to the heart’s right atrium A. Coronary arteries B. Vena cavae C. Aorta D. Pulmonary arteries

The heart structure responsible for initiating the heartbeat is known as the ___ A. Sinoatrial node B. Bundle of His C. Purkinje fibers D. Atrioventricular node

Which vessel returns oxygenated blood from the lungs to the heart A. Pulmonary veins B. Superior vena cava C. Pulmonary arteries D. Aorta

What is the primary function of the right ventricle A. Pumps blood to the systemic circulation B. Stores blood C. Receives oxygenated blood from the lungs D. Pumps blood to the lungs for gas exchange

The wall layer that contains cardiac muscle responsible for contraction is the ____ A. Pericardium B. Endocardium C. Epicardium D. Myocardium

Blood returning from the systemic circulation enters which heart chamber A. Left ventricle B. Right atrium C. Left atrium D. Right ventricle

Which chamber’s primary function is to pump oxygen-poor blood to the lungs A. Left atrium B. Right ventricle C. Right atrium D. Left ventricle

The valve that prevents backflow into the left ventricle after systole is the ____ A. Tricuspid valve B. Pulmonary valve C. Mitral valve D. Aortic valve

A heart rate consistently below 60 beats per minute is termed ___ A. Atrial fibrillation B. Bradycardia C. HyperCard is D. Tachycardia

Which conduction pathway directly transmits impulses from the AV node to the ventricles A. Purkinje fibers B. Bundle of His (AV bundle) C. SA node D. Intercalated discs

What term describes the rhythmic, electrical events that coordinate heartbeats A. Neural drive B. Respiratory cycle C. Myogenic impulse D. Cardiac conduction system

The heart valve between the right atrium and the right ventricle is called the ___ A. Mitral valve B. Pulmonary valve C. Aortic valve D. Tricuspid valve