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What kind of blood do veins carry? Is there any exception? If yes, give a reason.
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green veins carry blood to the body
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Veins have one-way valves instead of muscles, to stop blood from running back the wrong way. Generally, veins carry deoxygenated blood from the body to the heart, where it can be sent to the lungs. The exception is the network of pulmonary veins, which take oxygenated blood from the lungs to the heart.
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.
Arteries begin with the aorta, the large artery leaving the heart.
They carry oxygen-rich blood away from the heart to all of the body's tissues.
They branch several times, becoming smaller and smaller as they carry blood further from the heart.
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