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True or False

QuestionAnswer
Lead V1 is placed at the 4th intercostal space, right sternal border. True
Lead V2 is placed at the 5th intercostal space, left midclavicular line. False
Lead V3 is positioned between V2 and V4. True
Lead V4 is placed at the 5th intercostal space at the midclavicular line. True
Lead V5 is placed on the anterior axillary line, level with V4. True
Lead V6 is placed at the midaxillary line, level with V4. True
Leads V1 and V2 view the lateral wall of the heart. False
Leads V5 and V6 view the lateral wall of the heart. True
The left leg electrode serves as the ground electrode. False
Lead I measure electrical activity between the right arm and left arm. False
Lead II is the most commonly used for cardiac monitoring. True
Lead III records electrical activity from the right arm to the right leg. False
Leads I, II, and III are called bipolar limb leads. True
Lead aVL looks at the heart from the left arm. True
Lead aVF views the heart from the right foot. False
Lead aVR typically shows a negative QRS complex in a normal heart rhythm. True
Lead aVR views the right upper portion of the heart. True
Leads aVR, aVL, and aVF are considered unipolar limb leads. True
Lead aVF provides an inferior view of the heart. True
During polarization, the cardiac cells are in a resting state and ready for the next electrical impulse. True
Depolarization is the electrical process that causes the heart muscle to contract. True
Repolarization is the return of the cardiac cells to a resting state. True
Depolarization is the recovery phase of the cardiac cycle. False
Repolarization appears on the EKG as the P wave. False
The suffix “-algia” refers to pain or discomfort. True
Neuralgia refers to inflammation of a nerve. False
The sinoatrial node is known as the heart’s natural pacemaker. True
The SA node normally fires at a rate of 60–100 beats per minute. True
If the SA node fails, the AV node can take over as a secondary pacemaker. True
The SA node is located in the left atrium. False
Normal sinus rhythm means the SA node is controlling the heartbeat. True
In normal sinus rhythm, the heart rate is between 40–60 beats per minute. False
NSR must always include a P wave before every QRS complex. True
The sinoatrial (SA) node is the heart’s natural pacemaker. True
Tachycardia is defined as a heart rate below 60 bpm. False
Systole is the phase in which the heart muscle contracts and pumps blood out. True
Diastole is the relaxing phase of the heart, allowing the chambers to fill with blood. True
Depolarization is associated with the contracting phase of the heart. True
During systole, the ventricles relax and fill with blood. False
Diastole occurs after the ventricles contract and needs to reset for the next beat. True
The contracting phase of the heart corresponds to mechanical systole. True
The heart has three main layers: the epicardium, myocardium, and endocardium. True
The myocardium is the thickest layer of the heart and is responsible for pumping action. True
The endocardium is the outermost layer of the heart. False
The epicardium is also known as the visceral layer of the pericardium. True
The pericardium is a double-walled sac that surrounds and protects the heart. True
The parietal pericardium directly touches the heart muscle. False
The endocardium lines the inside chambers and valves of the heart. True
The myocardium is thicker in the left ventricle than in the right ventricle. True
The epicardium is made mostly of smooth muscle tissue. False
The pericardial cavity contains fluids that reduces friction as the heart beats. True
Inflammation of the pericardium is called myocarditis. False
The endocardium helps prevent blood clots from forming inside the heart. True
The myocardium receives blood supply from the coronary arteries. True
The pericardium’s main function is electrical conduction. False
The epicardium helps protect the heart by acting as a thin outer covering. True
Created by: H.C.A.
 

 



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