MICROANATOMY

Detailed explanation-1: -The arteries (red) carry oxygen and nutrients away from your heart, to your body’s tissues. The veins (blue) take oxygen-poor blood back to the heart.

Detailed explanation-2: -The only vein that carries oxygen-rich blood is the pulmonary vein.

Detailed explanation-3: -Blood is always red. Every molecule of hemoglobin-a protein in red blood cells that carries oxygen-contains four atoms of iron, which reflect red light and so give our blood the red color.

Detailed explanation-4: -The blood inside your veins is dark red. So, many people wonder why veins look green or blue through the skin instead of red. Veins are types of blood vessels. The other blood vessel types are capillaries and arteries.