Here are sources establishing that by 6-7 weeks, embryos have chambered hearts using muscle contractions to pump blood through veins exchanging oxygen and carbon dioxide.
Note: they are dating gestational development by Last Menstrual Period (LMP), not from moment of conception.
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>>“The ‘heartbeat,’ it literally tugs at the heartstrings, it makes you feel like, ‘Why would you do this?’ Never mind that there’s not a heart” yet in the embryo, he said.<<
>>four clearly defined chambers appear in the human heart from the eighth week of pregnancy<<
Embryos do have hearts and heartbeats. As early as six weeks postfertilization the four chambers have begun to form, and the heart is using coordinated muscle contractions to unidirectionally pump blood through the body exchanging oxygen and carbon dioxide. Embryology textbooks readily refer to this as a heartbeat. You can see quotes and screencaps from an embryology textbook (cardiovascular chapter) here: http://blog.secularprolife.org/2019/06/when-we-say-heartbeat.html
The article:
NASHVILLE, Tenn. (AP) — Dr. Michael Cackovic has treated his share of pregnant women. So when Republican lawmakers across the U.S. began pas