THE HUMAN HEART 

The heart is an essential muscular organ in humans and other animals that pumps blood through the blood vessele of the ciraulatoxy system it is roughly the size of a clanched fist and is located slightly to the left of the senter of your chest.

• Main job: it acts as a pump for the circulatory system, moving blood throughout the body.

• Chambers : it has four chamers ( two atria and to ventricles).

• Process:

      1 The right side pumps deoxygenated blood to the lungs ( to get oxygen ).

     2 the left side pumps oxygenated blood to the rst of the body.

• Key fact: the heartbeat is controlled by an electricl system making it the bodys natural pacemaker.