Ch 18 A&P Quiz

Depolarization of the atria corresponds to the ECG's

P wave

The following are structural components of the conducting system of the heart 1. Purkunje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches

The sequence in which excitation would move through thus system is which of the following? 4, 3, 2, 5, 1

Intercalated discs serve to transfer all of the following from cell to cell except

Z-lines

The contraction phase of the upper chambers of the heart is called

atrial systole

The great and middle cardiac veins drain blood into the

coronary sinus

Drugs that block the beta-one adrenergic receptors will

decrease heart rate

The P wave of the electrocardiogram is a signal from

depolarization of the atria

Stroke volume depends on all of the following except

end-systolic volume

The ________ lines the chambers of the heart, covers the heart valves, and is continuous with the endothelium.

endocardium

The muscle layer of the heart is the

myocardium

During the T wave of the electrocardiogram, the ventricles are____ and functionally _______.

repolarizing; relaxing

Analyzing of the electrocardiogram can reveal all of the following except the

stroke volume

A faster-than-normal heart rate is called

tachycardia

The T wave on an ECG tracing represents

ventricular repolarization