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

myocardium

This sling-like structure supports the heart

pericardium

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

right ventricle

The right ventricle pumps to the

pulmonary artery

Vessel(s) that carry(ies) blood from the pulmonary capillaries to the left atrium

pulmonary veins

The aorta receives blood from the

left ventricle

Blood flows from the right atrium through this atriovascular valve to the right ventricle

tricuspid

Which of the following structures "sees" unoxygenated blood?

pulmonary artery

Which of the following "sees" oxygenated blood?

pulmonary veins

Chordae tendineae are not associated with this valve

aortic

With which of the following is "lubb-dupp" associated?

closing of heart valves

Which of the following supplies oxygenated blood to the heart muscle?

coronary arteries

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

SA node

The pacemaker of the heart is located in the upper wall of the

right atrium

Referring to the ECG, the P wave represents

atrial depolarization

Referring the the ECG, the QRS complex represents

ventricular depolarization

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

chordae tendinae

These conducting fibers rapidly spread the electrical signal throughout the ventricles

Purkinje fibers

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

semilunar

All of the following are electrical terms except

sarcomere

Which of the following must precede ventricular contraction?

ventricular depolarization

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

aortic

Complete the sequence: blood flows from the right atrium to the right ventricle to the pulmonary artery to the

pulmonary capillaries

What event causes the pulmonic valve to open?

an increase in the pressure within the right ventricle

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

myocardium

The pericardium is part of the

epicardium

The mitral and the bicuspid valves

are the same valves

The pulmonic and aortic valves

are semilunar valves

Complete the sequence: blood flows from the pulmonary capillaries to the pulmonary veins to the left atrium to the left ventricle to the

aorta

The atrioventricular node (AV node)

delays the electrical signal coming from the atria into the ventricles

The purpose of this structure is to momentarily delay the spread of the signal from the atrium to the ventricles

AV node

Which of the following is an electrical event?

depolarization

Which of the following is a result of ventricular contraction?

Blood is pumped into the pulmonary artery and the aorta

Under what condition is blood most likely to flow "backward" (e.g., from the left ventricle back into the left atrium)?

an insufficient mitral valve

What are ventricles "doing" during atrial contraction?

relaxing

The Purkinje Fibers

conduct electrical signals throughout the ventricles

Which cavity first receives unoxygenated blood from the vena cava?

right atrium

What is the name of the valve that prevents backflow of blood into the right atrium when the right ventricle contracts?

tricuspid valve

What is the case of the heart sounds "lubb-dupp"?

closing of the heart valves

Which of the following is not true of the heart?

the pericardium is composed of actin and myosin

Which of the following is least descriptive of the myocardium?

thicker in the left atrium than the right ventricle

Which of the following is a function of a valve?

regulates the direction of the flow of blood through the heart

Which of the following is true of the structures of the electrical conduction system?

in normal sinus rhythm, the electrical signal arises within the SA node

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

blood flows from the ventricle through this valve into the pulmonary artery

An accumulation of excess fluid in the pericardial space

causes external compression of the heart

A hole in the interventricular septum causes

blood to shunt from the left ventricle to the right ventricle

Which structure "sees" oxygenated blood

pulmonary veins

Which group is incorrect?

structures that carry unoxygenated blood: right ventricle, venae cavae, pulmonary veins

Which group is incorrect?

abnormal heart rates: tachycardia, bradycardia, normal sinus rhythm

Which group is incorrect?

parts of the conduction system: SA node, AV node, bundle of His, Purkinje fibers, medulla oblongata

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