Heart is a house - let's build it healthy! Heart... an organ so small it can fit in the palm of your hand. But, its structure and functions are amazing. "Heart can be compared to a house'' Heart is a house Structure of the heart: Heart Chambers Just like a house has different rooms like living room, kitchen, bedroom, similarly in the heart there are four separate rooms, two rooms above and two rooms below. The upper chambers of the heart are called `right atrium', `left atrium', and the lower chambers are called `right ventricle' and `left ventricle'. Heart wall: Just as there are walls in a house to separate one room from another, so there are walls in the heart . That is, there is a septum between the two atria and between the two ventricles. The walls of the lower chambers are slightly thicker than those of the upper chambers. These walls are also made up of muscles and tissues. a) Architect of the heart We will change the building structure of the ...