The lesson deals with the location of the human heart and its location. With the help of suitable animations it shows how carbon – dioxide rich blood flows within the heart and enters the lungs. It also shows how oxygen – rich blood reaches the heart from the lungs. The lesson also states the importance of having an efficient transport system.
Thus within the heart the flow of the impure blood and the purified blood from the atria to the ventricles and then out of the heart to the lungs and aorta respectively is clearly demonstrated with supporting voice over.