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Intrinsic Regulation of Heart Rate and Myocardial Impulse Transmission Quiz

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Intrinsic Regulation of Heart Rate and Myocardial Impulse Transmission Quiz

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Questions and Answers

What is the role of the sinoatrial (SA) node in the heart?

Creates the electrical field throughout the body
Regulates the heart rate during physical activity
Controls the contraction of the atria (correct)
Controls the contraction of the ventricles

Why does the right side of the heart contract slightly sooner than the left side?

Due to differences in blood pressure in the right and left sides
Due to asynchronous contraction caused by nerve impulse transmission (correct)
Because of genetic differences between the right and left sides
Because of variations in hormone levels

What is the function of an electrocardiogram (ECG)?

To measure oxygen levels in the blood
To monitor lung function
To control the heart's pumping rate
To represent a composite record of the heart’s electrical events (correct)

What is essential for a valid ECG tracing?

Proper electrode placement (D) Signup and view all the answers

Which part of the heart initiates the electrical impulse that spreads across the atria?

Sinoatrial (SA) node (D) Signup and view all the answers

What is the purpose of cardiac conduction in controlling heart muscle activity?

To regulate rhythmic contraction and dilation of heart muscle (C) Signup and view all the answers

What is the function of the right and left crus in the heart?

To facilitate the spread of impulse into the ventricles (C) Signup and view all the answers

Which part of the heart is primarily responsible for the depolarization of the atria before contraction?

Sinoatrial node (SA) (A) Signup and view all the answers

What does the QRS complex in an ECG signal?

Ventricular depolarization (A) Signup and view all the answers

What does a T-wave represent in an ECG waveform?

Ventricular repolarization during ventricular diastole (C) Signup and view all the answers

In a normal ECG phase, when do the ventricles contract?

After the QRS complex (D) Signup and view all the answers

What can large low spaces on an ECG graph indicate about the heart's function?

Heart block causing lack of contraction signals (A) Signup and view all the answers