There is one artery that carries deoxygenated blood and there are some veins that carry oxygenated blood. To get to the bottom of this little mystery we need to talk about the Heart and Lungs. This is a subject that is near and dear to my heart. The heart is a two sided, four chambered pump. It is made up mostly of muscle.
Heart muscle is very special.
Unlike all the other muscles in the body, the heart muscle cannot afford to get tired. Not a pretty sight. So, heart muscle is always expanding and contracting, usually at between 60 and 100 beats per minute. The right side of the heart is the low pressure side. Blood enters the right heart through a chamber called the Right Atrium.