Question

Substances abundant in the dull purplish red blood in the veins are

Answer 1

The blood from the arteries of the heart is full of oxygen and is sent all over the body.

The presence of oxygen makes the blood bright red.

But the blood coming back to the heart from the veins is dull purplish because of the presence of carbon dioxide and waste materials using up the oxygen in the blood.

Hence, Substances abundant in the dull purplish red blood in the veins are carbon dioxide and waste materials.

Carbon dioxide and waste material is the answer.

Answer 2

Substances abundant in the dull purplish-red blood in the veins are generally urea.

Blood gets a darker shade of it, often becoming dark red or even purplish due to the less amounts of oxygen in it.

This blood is also called deoxygenated blood and it appears blueish near the veins due to the scatter of light near the skin.