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