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Where does hematopoiesis, or blood cell formation, primarily occur in adults?
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17. The Blood
Introduction To Blood
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What does blood plasma contain that blood serum does not?
A
Platelets
B
White blood cells
C
Clotting factors
D
Red blood cells
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Begin by understanding the components of blood. Blood is composed of plasma and formed elements such as red blood cells, white blood cells, and platelets.
Blood plasma is the liquid portion of blood and contains water, electrolytes, nutrients, hormones, waste products, and proteins, including clotting factors.
Blood serum is derived from blood plasma but does not contain clotting factors. Serum is obtained after blood has clotted and the clotting factors have been used up.
Identify the key difference between plasma and serum: plasma contains clotting factors, while serum does not.
Conclude that the presence of clotting factors is the distinguishing feature of blood plasma compared to blood serum.
