The heart of the 5 days' chick embryo during dilatation and contraction. A functional hypothesis based on morphological observations.
D000818:Animals; D002642:Chick Embryo / Q000502:physiology*; D004106:Dilatation; D005318:Fetal Heart / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology*; D009119:Muscle Contraction