| Description |
Traces heart development in the early chick embryo, showing the primitive streak stage, heart-forming cells in the blastoderm, development and fusion of paired endocardial tubes and of the epimyocardium, gut closure, and later development of the heart, including changes in shape and pulse rate; studies the effects of development of the truncus, ventricle, and sino-atrial region on the rate of heartbeat.
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