Both blood stem cells and the endothelial lining of blood vessels arise from blood islands.
The region of the early heart tube that corresponds to the inflow and out flow respectively are:
Embryonic red blood cells only differ from adult cells in still having nuclei.
The embryo cardinal venous vessels which drain into the sinus venosus are:
The embryonic heart rate rises throughout development.
ANAT2341 - Early Heart Lecture