Heart and Circulatory System Flashcard

Front

The middle muscular layer of the heart wall is the:

Back

Myocardium

Front

The pericardial cavity is located between: Epicardium and myocardium, Parietal and visceral pericardium, Endocardium and myocardium, Atria and ventricles

Back

Parietal and visceral pericardium

Front

Which valve prevents backflow from the right ventricle to the right atrium?

Back

Tricuspid valve

Front

The “lub” sound (S1) of the heart is caused by:

Back

AV valves closing

Front

Blood returning from the lungs enters the: Right atrium, Left atrium, Right ventricle, Left ventricle

Back

Left atrium

Front

The left ventricle pumps blood into which circulation?

Back

Systemic

Front

Which structure acts as the heart’s natural pacemaker?

Back

SA node

Front

The contraction phase of the cardiac cycle is called:

Back

Systole

Front

Cardiac output equals:

Back

Stroke volume × Heart rate

Front

The neurotransmitter that slows the heart rate is: Epinephrine, Norepinephrine, Acetylcholine, Dopamine

Back

Acetylcholine