This is what a beating heart ready to be transplanted looks like

This machine keeps the heart beating during a transplant

A Beating Heart

Beating heart from a recently harvested albacore tuna.

Beating heart in a box

My heart is beating for you

The 'beating heart' of an ant

An ant's "beating heart"

An ant's "beating heart"

The "beating heart" of an ant

An ant's "beating heart"

The "beating heart" of an ant