Question

Which of the following is responsible for the red colour of the blood?
A. Plasma proteins
B. Haemoglobin
C. WBC
D. None of the above.

Answer 1

Hint: When one of the given options binds with oxygen it gives the blood its color so let us now find the correct answer.

Complete answer:
To answer this question, at first, we have to know the components of blood. Blood consists of many cell types; however the distinctive red colour comes from the aptly named red blood cells (RBCs). RBCs have their rich red colour due to vitally important iron-containing protein referred to as hemoglobin. The protein picks up oxygen molecules because the blood exchanges gases in the lungs. The RBCs then carry oxygen to the far reaches of the body, where it is released for use by different cells, such as those of the brain and muscles.
Now lets us find the solution from given options-
Blood proteins, additionally termed plasma proteins, are proteins found in blood plasma. They serve many different functions, along with transport of lipids, hormones, nutrients and minerals in activity and functioning of the immune system. The plasma proteins suspended in blood cannot circulate throughout the semi permeable capillary cell membrane, and so they remain withinside the plasma.They are not responsible for the red colour of blood.
The red colour of blood comes from the aptly named red blood cells (RBCs). RBCs have their rich red colour due to vitally important iron-containing protein referred to as hemoglobin. The protein carries oxygen molecules because the blood exchanges gases in the lungs. Just as importantly, after the RBC drops off its load of oxygen, its hemoglobin picks up carbon dioxide, the waste product of these brain and muscle cells, and brings it again to the lungs to be breathed out.
WBCs are called leukocytes;they are an important part of the immune system. These cells help fight against infections by attacking bacteria, viruses, and germs that invade the body. White blood cells originate withinside the bone marrow however flow into throughout the bloodstream. So, they’re not responsible for the red colour of blood.

Thus, the right answer is option B. i.e. Hemoglobin.

Note: WBC’s are located within the buffy coat, a thin, typically white layer of nucleated cells among the sediment red blood cells and the blood plasma.