Circulatory System
Red blood cells transport oxygen. White blood cells protect against disease.
Blood platelets help the blood to clot. White blood cells help
to send a alarm to tell the
other functions to get ready
to fight away unwanted
germs. There are many red
blood cells but not as many
white blood cells.
Blood Cells
Veins return blood to the heart. They are very simlar
to the artries because they
transport blood at a lower preasure than the artries
the veins are not as strong as the artries.
Veins and Artries