Abstract
As we have pointed out elsewhere1, there is considerable evidence for believing that the conducting systems of mammalian and avian hearts (nodes and Purkinje fibres) are neomorphic developments, evolved in response to functional requirements in these homoiothermal vertebrates, and not remnants of more extensive tissue of similar structure in lower vertebrate hearts2,3 or embryonic muscle4,5.
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References
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DAVIES, F., FRANCIS, E. Age Changes in Size of Muscle Fibres of the Marsupial Heart. Nature 149, 410–411 (1942). https://doi.org/10.1038/149410b0
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DOI: https://doi.org/10.1038/149410b0
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