Why is blood that flows from the lungs to the heart bright red rather than dark red?

Question

Why is blood that flows from the lungs to the heart bright red rather than dark red? (A) Oxygen makes it red (B) Carbon dioxide makes it red (C) Gastric juices produce the red colour of the blood (D) The lungs add a pigment (dye) to blood as it flows through them

Tardigrade Admin · Accepted Answer

Correct answer is (a) Oxygen makes it red

Q. Why is blood that flows from the lungs to the heart bright red rather than dark red?

Oxygen makes it red

Carbon dioxide makes it red

Gastric juices produce the red colour of the blood

The lungs add a pigment (dye) to blood as it flows through them

Correct answer is (a) Oxygen makes it red