The heart is enclosed in a sac called

Blood flows from the left ventricle through the

Cardiac output is

The second heart sound "dupp" is actually the sound of the

Which of these delivers blood to the left atrium

Pectinate muscles are found in the ____; trabeculae carneae are found in the ___.

An average heartbeat, or cardiac cycle, lasts approximately

The P wave of the ECG represents

An incomplete interatrial septum is called

What node typically generates impulses about 75 times every minute

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