Question

Why is blood bright red in arteries while darker in veins?
please answer fast its urgent

Answer 1

Hemoglobin bound to oxygen absorbs blue-green light, which means that it reflects red-orange light into our eyes, appearing red. That's why blood turns bright cherry red when oxygen binds to its iron. Without oxygen connected, blood is a darker red color.

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Answer 2

Answer:

i carrys all un wanted things from the body soo the blood is dark in veins