Page 125 - The Miracle of Human Creation

Day 23 Day 25 Day 26-27
direc-
tion of
blood the cham-
blood ves- bers begin
sels coa- flow the heart to develop
lesce
as a sin-
gle
chamber

ventricle Day 33 Day 40
and atrium
developing atrium
sulcus develop-
ing between the
atrium and the
ventricle.
developing
ventricle

THE FORMATION OF THE HEART
The formation of the heart is an obvious wonder of cre-
ation. Suddenly, some multiplying cells begin to contract
and expand. Later, hundreds of thousands of these cells
come together to form the heart. This heart will continue
rd
to beat for a lifetime. On the 23 day after fertilisation, the
blood vessels of the embryo begin to coalesce; on the
25th day, only one chamber can be seen. On the 26th and
27th days the other chambers begin to develop. On the
33rd day the ventricles and the atria begin to develop and
on the 40th day the heart is fully formed. In the picture of
the embryo to the left, the heart is shown in red.