The heart is actually a sophisicated muscle that functions as a pump to drive blood through the cardiovascular system of arteries, veins and smaller blood vessels that supply organs and tissues of the body.
(The heart; is actually; a sophisicated muscle that functions as a pump) (smaller blood vessels; supply; organs and tissues of the body)
The heart smaller blood vessels
is actually supply
a sophisicated muscle that functions as a pump
organs and tissues of the body