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As the heart muscle contracts, it propels the blood out into the vascular system. The heart’s chambers and valves are arranged to direct the flow of the blood as the heart beats. The heart has two ...

NEW! Download the addenda to the family-group list of fossil fishes as a PDF (last updated Aug 2024). See Family Group Names for future updates by R. van der Laan. Fricke, R., Eschmeyer, W. N. & R.