Because it lacks oxygen, the waste-rich blood that flows through the veins has a deep red color, almost like maroon.
Because the walls of the veins are rather thin, the waste-rich blood is visible through the skin on some parts of the body.
Look at your wrist or hands you can probably see your veins carrying your blood back to your heart.
Your skin refracts light, though, so that deep red color actually appears a little blue from outside the skin.
Types of blood cells Red blood cells Platelets White blood cells Form shaped like discs w/ dimple on each side not complete cells different shapes & sizes Function carry oxygen form sticky blood clots protect body from germs Disorder sickle cell anemia embolism leukemia
1. Blood containing wastes & CO 2 flows from body right atrium . 2. Right atrium contracts, squeezes blood right ventricle . 3. Right ventricle contracts, pumping blood artery leading lungs . 4. Blood containing oxygen flows in veins from lungs left atrium . 5. Goes to the body thru. the left ventricle Video-How the Heart Works Blood’s Journey through the Body