Why does bright red colour blood turn dark once circulation begins?

$O_{2}$ is replaced by $N H_{3}$

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Red pigment absorbs copper salts

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Red pigments get oxidised

No worries! We‘ve got your back. Try BYJU‘S free classes today!

$O_{2}$ is replaced by $C O_{2}$

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D
$O_{2}$ is replaced by $C O_{2}$

The oxygen molecules that the blood carries reacts with the iron compounds in the haemoglobin molecule, giving blood its characteristic red colour. As blood circulates, it delivers essential nutrients and oxygen to all organs and cells in the body. As circulation progresses, the overall $O_{2}$ concentration in the blood decreases and finally it is replaced completely by $C O_{2}$ , thereby making it darker.

Suggest Corrections

Similar questions

Why does blood turn dark red as it circulates through the body?

Which pigment imparts red colour to blood?

Which pigment gives red colour to the blood?

Join BYJU'S Learning Program