Describe the flow of blood in the human body, including through each of the four chambers of the heart. explain how the blood changes as it moves through various locations in the body.

The blood changes as one size is deoxgenated and the other is not as one goes to the lungs one comes from the lungs one goes to the heart and one goes from the heart

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers