'When cardiac muscle cells contract, they push blood out of this organ and into the arteries'
Heart
THE BODY HUMAN: When cardiac muscle cells contract, they push blood out of this organ and into the arteries
When cardiac muscle cells contract, they push blood out of this organ and into the arteries
When cardiac muscle cells contract, they push blood out of this organ and into the arteries
THE BODY HUMAN
Heart
THE BODY HUMAN