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You're watching a show on TV about the history of scientific thought in Europe prior to 1800.The narrator correctly states that at that time
Ventricles
The two lower chambers of the heart responsible for pumping blood out of the heart to the lungs and the rest of the body.
R Wave
In electrocardiography, the R wave is part of the QRS complex, representing ventricular depolarization and the main spike seen in an ECG tracing.
Contraction
A shortening or increase in tension of muscle fibers, often resulting in movement or maintenance of posture.
Ventricles
The two lower chambers of the heart that are responsible for pumping blood out of the heart to the lungs and the rest of the body.
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