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Science 5 May 2006:
Vol. 312. no. 5774, p. 653
DOI: 10.1126/science.312.5774.653j
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This Week in Science

Figure 1 Vertebrates hearts begin as a valveless tube that has generally been described as a peristaltic pump. Using confocal laser scanning microscopy and time-resolved three-dimensional visualization methods, Forouhar et al. (p. 751) followed the heart wall and blood cells in the zebrafish embryo. The embryonic heart tube did not show the properties expected of a peristaltic pump. Instead, elastic wave propagation and reflection in the heart tube produced an action that is more consistent with a hydroimpedance pump influenced by mechanical features of the heart tube, such as its diameter, length, and elasticity.

CREDIT: FOROUHAR ET AL.




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