Question

Oxygen carrier in human blood is?
A. Iron
B. Methaemoglobin
C. Haemoglobin
D. Haemocyanin

Answer 1

In the human body, the blood contains oxygen and carbon dioxide usually from an artery, in order to evaluate lung function and help detect an acid-base imbalance that could indicate a respiratory, metabolic or kidney.

Complete Answer:
- Haemoglobin is a respiratory pigment which carries the oxygen in human blood. It contains an outsized iron containing group called haem which provides haemoglobin red colour and is liable for binding the oxygen which is transported by the haemoglobin within the bloodstream. Normal haemoglobin content is about 15gm/100mL of blood for males while it's slightly less in females, about 13gm/100mL of blood.
- Haemoglobin-based oxygen carriers (HBOCs) are synthesized from chemically modified human or bovine Haemoglobin and are used as an alternative to traditional resuscitative fluids like crystalloids, artificial colloids, and blood.
- Methaemoglobin is the stable form of haemoglobin but it is not capable of releasing oxygen to the tissues.
- Iron is one of the components of haemoglobin, which carries the oxygen.
- Haemocyanin is an oxygen carrier in some of the vertebrates.

So from the above discussion it is concluded that the right answer will be C as Haemoglobin is the molecule which carries almost all the oxygen in human blood.

Note: Haemoglobin in blood carries oxygen from the lungs or gills to remaining parts of the body. There it releases the oxygen to allow aerobic respiration to supply energy to power the functions of the organism within the process called metabolism. A healthy individual has 12 to twenty grams of Haemoglobin in every 100 ml of blood. Haemoglobin is involved within the transport of other gases: It carries a number of the body's respiratory carbon dioxide as carbamino Haemoglobin, during which carbon dioxide is bound to the heme protein. The molecule also carries the important regulatory molecule nitric oxide sure to a globin protein thiol group, releasing it at an equivalent time as oxygen.