When Does a Baby’s Heart Start Beating? The Science Behind the First Heartbeat in the Womb
Автор: MedLifeLink
Загружено: 2025-11-04
Просмотров: 148
The first heartbeat inside the womb is one of the earliest signs of human life. This video explains scientifically and medically when and how a baby’s heart begins beating — from fertilization to the formation of the primitive heart tube, electrical activation, and first rhythmic contractions.
Scientific Evidence Summary:
• Around 21–23 days after fertilization, cardiac cells begin spontaneous rhythmic contractions, forming the earliest heartbeat.
• By week 5 of pregnancy, the developing heart is pumping blood through a single tube.
• By week 6–7, the heart develops chambers and the heartbeat becomes strong and detectable through transvaginal ultrasound.
• The early beat is triggered by pacemaker cells forming near the future sinoatrial (SA) node, generating electrical impulses that cause contraction.
Sources support from standard medical and embryology texts such as:
• The Developing Human: Clinically Oriented Embryology (Moore & Persaud)
• Gray’s Anatomy
• CDC and NIH fetal development data
This channel explores the wonders of human biology — backed by embryology, medical research, and verified developmental science.
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