The clear fluid extracted from a bag of centrifuged, whole uncoagulated blood contains?

a. water, proteins, blood cells





b. water, proteins, electrolytes, glucose





c. water, electrolytes, glucose but no proteins





d. electrolytes, glucose but no water





e. water and blood cells onlyThe clear fluid extracted from a bag of centrifuged, whole uncoagulated blood contains?
Generally speaking, the answer to this is b. However...





Firstly, plasma and serum are NOT the same. Serum does not conatin any clotting factors or fibrinogen. Plasma is simply the non-cellular component of blood (i.e. the supernatant of a centrifuged, anti-coagulated sample). Hence plasma can be given as a transfused product not only to replace fluid, but also to correct coagulopathies (clotting disorders).





Secondly, when a whole blood is centrifuged you get a three-layed product. Top to bottom, these are plasma, buffy coat (platelets and white cells) and red cells. The seperation of these 'layers' depends on both the speed of the centrifuge and the time spent spinning.The clear fluid extracted from a bag of centrifuged, whole uncoagulated blood contains?
The answer is (b)





The red and white cells and platelets will be centrifuged to the bottom leaving the yellow fluid called plasma.





Note that plasma does NOT simply consists of water, electrolytes, glucose and protein. There will be other components.





Also, the yellow fluid (plasma) will contain the protein fibrinogen since the blood has not coagulated. If it had the clear yellow liquid is called serum (plasma without fibrinogen).
b.


Centrifugation simply accelerates free falling. Therefore, particles heavier (denser) than water will sink. Blood cells (like most other cells) will sink.
Platelets.
This is blood plasma.





So... 'b'





No cells, but large quantity of water and includes glucose and proteins.
b