Anatomy and Physiology of the Circulatory and Ventilatory Systems

@debsei @Ajinkx344523 @RJ4arizona @tcani “The heart is the first organ to develop. In the human embryo, the heart begins beating at about 21 days after conception.” https://t.co/bvzrgxO2C6

@RoseRo21407726 @BeccCobain @LBR4567 @MegGold3 @alan_tegel Every embryology textbook I've checked says that it's a heart (with a functional "pacemaker"). “The heart is the first organ to develop. In the human embryo, the heart begins beating at about 21 d

@RoseRo21407726 @BeccCobain @alan_tegel Textbooks say it's a heart: “The heart is the first organ to develop” https://t.co/bvzrgxNuMy “The heart is the first organ to function in human embryos. It begins beating as early as the 21st day, and starts pumpi

@Lab_Rat_42739 @BeccCobain “The heart is the first organ to develop. In the human embryo, the heart begins beating at about 21 days after conception.” https://t.co/bvzrgxO2C6