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Cardiovascular System: The Heart

Across
The valve located between the right atrium and ventricle.
The valve located between the left atrium and ventricle.
The most superficial layer of the heart wall.
Joins the cardiac muscle cells.
The "contraction" phase.
The ventricle with a thicker wall.
Down
The circuit that consists of deoxygenated blood being directed to the lungs.
Layer that surrounds heart.
The thick wall between left and right ventricles is called the interventricular
Number of stages in the cardiac cycle.
The "relaxation" phase.
The "pacemaker" of the heart.