The heart is a hollow muscle that pumps blood throughout the body day in and day out, resting only between beats.
(The heart; is; a hollow muscle that pumps blood throughout the body day in and day out) (a hollow muscle; pumps; blood; T:throughout the body day in)
The heart a hollow muscle
is pumps
a hollow muscle that pumps blood throughout the body day in and day out
blood T:throughout the body day in