Question

why blood looks red in colour ​

Answer 1

Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that's crucial for carrying oxygen through your bloodstream. ... Hemoglobin bound to oxygen absorbs blue-green light, which means that it reflects red-orange light into our eyes, appearing red.

Answer 2

Answer:

Human blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that's crucial for carrying oxygen through your bloodstream. ... That's why blood turns bright cherry red when oxygen binds to its iron. Without oxygen connected, blood is a darker red color.