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The heart

Approximately, what is the size of the human heart?
An open hand
A closed fist
A tennis ball
A thumb
Which chambers of the heart have thick walls to withstand high blood pressure?
Ventricles
Atria
Veins
Arteries
What is the function of atrioventricular valves?
To withstand high blood pressure
To generate myogenic contractions
To pump blood to the lungs
To prevent the back flow of blood
Which blood vessel pumps blood to the rest of the body?
Aorta
Inferior vena cava
Pulmonary artery
Superior vena cava
What does "myogenic contraction" refer to?
The contraction of the atria
The heart initates its own heart rate with the need of external stimuli
The heart initiates its own heart rate without the need of external stimuli
The contraction of the ventricles
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