The structures that increase forcefulness of contraction within the right atrium are ______ muscles, whereas the structures that prevent eversion of the AV valves are ______ muscles. Multiple Choice pectinate; papillary papillary; intercalated tendineal; trabecular
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Step 1: The pectinate muscles are located in the walls of the atria and help to increase the forcefulness of contraction. Show more…
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