Answer:
Un-oxygenated blood flows from the vena cava into the right atrium.
THEN
The right ventricle receives the blood and pumps it to the lungs for oxygenation.
THEN
The oxygenated blood then returns to the left atrium and enters the left ventricle where it is pumped through the aorta to the systemic circulation.
Explanation:
As you can see both drawings take up the same amount of surface area and the same amount of surface area is colored. The one on the right has 12 spaces, while the one on the left only has 3.
White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Hope this helps