THE HEART
• the muscular organ that pumps blood
through a network of blood vessels
• Pericardium!saclike membrane
• lies within the thoracic (chest) cavity
• Septum!verticallydivides the heart into
two sides.
• The right side pumps blood to the lungs,
and the left side pumps blood to the other
parts of the body.
• Each upper chamber is called an _______,
• Each lower chamber is called a ________.