Question

What causes blood color red?​

Answer 1

Answer:

Haemoglobin ( present in RBCs )

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. Heme contains an iron atom which binds to oxygen; it's this molecule that transports oxygen from your lungs to other parts of the body.