Here are 5 simple ways to say: "Veins carry darker red blood empty of oxygen" — but a quick note first: the blood in veins isn’t totally empty of oxygen; it just has less oxygen, so it looks darker.
- Veins carry darker red blood that has less oxygen.
- The blood in veins is darker because it doesn’t have much oxygen.
- Veins bring darker-colored blood back to the heart with only a little oxygen.
- Blood in the veins looks darker since it’s low on oxygen.
- Veins move darker blood that needs more oxygen back to the lungs.
Short step-by-step:
- Your heart sends bright red, oxygen-rich blood out to your body.
- Your body uses the oxygen, so the blood becomes darker and has less oxygen left.
- Veins carry that darker, low-oxygen blood back to the heart and lungs to get more oxygen.