Multiple Choice
In an adult human, approximately what percentage of blood plasma is water?
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17. The Blood
Introduction To Blood
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In the context of an introduction to blood, what is the liquid portion of blood called?
A
Platelets
B
Serum
C
Erythrocytes
D
Plasma
Verified step by step guidance1
Understand that blood is composed of two main components: the formed elements (cells and cell fragments) and the liquid portion.
Identify the formed elements: erythrocytes (red blood cells), leukocytes (white blood cells), and platelets (cell fragments involved in clotting).
Recognize that the liquid portion of blood is the fluid that suspends these formed elements and carries nutrients, hormones, and waste products.
Differentiate between plasma and serum: plasma is the liquid portion of blood containing clotting factors, while serum is plasma without clotting factors.
Conclude that the correct term for the liquid portion of blood, including clotting factors, is plasma.
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