A Fetus' Heartbeat Starts Days Earlier Than We Thought
New research recorded heartbeats in mouse embryos while the heart was still forming.By Matt Picht | October 11, 2016
The first organ to form inside a human fetus is the heart. And new research says that heart might start beating earlier than we previously thought it did.
A team of U.K. scientists just published a paper pinpointing at what stage of development a heartbeat begins.