The heart and the 4 chambers

I learnt that there are 4 chambers in our heart called the left and right atria and also the left and right ventricle.
I found it difficult to match the correct words to the right label.
The atria and ventricle  works as a team to help the heart pump blood around our body. The atria which is filled with blood dumps the blood onto the ventricle, then the ventricle squeezes the blood out pumping blood out of the heart.