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This structure connects the cusps of the AV valves to the ventricles.


A) Purkinje fibers
B) AV node
C) bundle of His
D) chordae tendineae

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This sling-like structure supports the heart.


A) pericardium
B) chordae tendineae
C) myocardium
D) endocardium

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A hole in the interventricular septum causes


A) a right-to-left shunt.
B) extreme cyanosis.
C) blood to shunt from the left ventricle to the right ventricle.
D) blood to shunt from the left ventricle to the pulmonary artery.

Correct Answer

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All of the following are electrical terms except


A) sarcomere.
B) depolarization.
C) action potential.
D) repolarization.

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A

The atrioventricular node (AV node)


A) is the pacemaker of the heart.
B) is located in the upper part of the right atrium.
C) has a rate that is normally faster than the SA node.
D) delays the electrical signal coming from the atria into the ventricles.

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Which of the following structures "sees" unoxygenated blood?


A) aorta
B) left ventricle
C) pulmonary artery
D) pulmonary veins

Correct Answer

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Which of the following semilunar valves "sees" oxygenated blood?


A) mitral
B) bicuspid
C) aortic
D) pulmonic

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Which of the following is not true of the heart?


A) The heart is located within the mediastinum.
B) The apex is located left of the sternal midline at the level of the fifth intercostal space.
C) The base of the heart is located at the level of the second rib.
D) The pericardium is composed of actin and myosin.

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Which layer of the heart has actin,myosin,and intercalated discs?


A) myocardium
B) endocardium
C) epicardium
D) pericardium

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A

Where does the cardiac action potential (cardiac impulse) normally originate?


A) AV node
B) Purkinje fibers
C) ectopic focus
D) SA node

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Which of the following is least related to the mitral valve?


A) left heart
B) bicuspid
C) semilunar
D) chordae tendineae

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Chordae tendineae are not associated with this valve.


A) aortic
B) mitral
C) tricuspid
D) bicuspid

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Referring to the ECG,the QRS complex represents


A) ventricular contraction.
B) ventricular repolarization.
C) ventricular relaxation.
D) ventricular depolarization.

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D

The pulmonic and aortic valves


A) are atrioventricular valves.
B) "see" only oxygenated blood.
C) are attached to the ventricular walls by chordae tendineae.
D) are semilunar valves.

Correct Answer

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Which group is incorrect?


A) atrioventricular valves:tricuspid,bicuspid,mitral
B) layers of the heart:epicardium,myocardium,endocardium
C) abnormal heart rates:tachycardia,bradycardia
D) parts of the conduction system:SA node,AV node,bundle of His,Purkinje fibers,medulla oblongata

Correct Answer

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Which of the following is least true of the aortic valve?


A) It is also called the left semilunar valve.
B) It "sees" oxygenated blood.
C) Blood flows from the ventricle through this valve into the pulmonary artery.
D) An incompetent aortic valve allows blood to leak from the aorta back into the left ventricle.

Correct Answer

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The pericardium is a part of the


A) myocardium.
B) diaphragm.
C) epicardium.
D) endocardium.

Correct Answer

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Which group is incorrect?


A) semilunar valves:pulmonic,aortic
B) structures that carry oxygenated blood:pulmonary veins,left ventricle,aorta
C) layers of the heart:epicardium,myocardium,endocardium
D) abnormal heart rates:tachycardia,bradycardia,normal sinus rhythm

Correct Answer

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This is the hardest working cardiac chamber and therefore has the thickest myocardium.


A) right atrium
B) right ventricle
C) left atrium
D) left ventricle

Correct Answer

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This layer of the heart allows it to act as a pump.


A) epicardium
B) myocardium
C) pericardium
D) endocardium

Correct Answer

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