What part of the heart is responsible for causing the sythmic contraction of the atria and the ventricles?

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the sinoatrial (SA) node

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What is the Contraction phase of the heart?  What valve separates the atria and ventricles?  Layer of heart wall responsible for contraction?  How many atria's does a frog have in it's heart?  Which part of the heart is contracting causing the pulse?  What valves are located between the atria and the ventricles?  The pressure in major arteries while the ventricles of the heart relax?  Name the set of nerve fibers that cause the contraction of the ventricles?  What is the blood pressure that results from the contraction of the ventricles?  What are the atria and the ventricles How do they differ in structure and function?