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How did southerners react to black troops fighting for the Union?
Plethysmogram
A graph or recording that measures changes in volume within an organ or whole body (often the blood volume changes in the limbs).
Pressure Wave
A type of wave mechanism that occurs when a fluid or gas changes velocity, often seen in the circulatory system as a pulse.
Blood Volume
The total amount of blood circulating within an individual's vascular system.
Ventricular Systole
The phase of the heartbeat when the ventricles contract, pumping blood out of the heart and into the arteries.
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