Multiple Choice
In the coagulation cascade, what is the first procoagulant that the extrinsic and intrinsic pathways have in common?
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17. The Blood
Introduction To Blood
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Which of the following is a formed element of blood?
A
Serum
B
Electrolytes
C
Erythrocytes
D
Plasma
Verified step by step guidance1
Understand the components of blood: Blood is composed of plasma and formed elements. Plasma is the liquid portion, while formed elements include cells and cell fragments.
Identify the formed elements: The formed elements of blood are erythrocytes (red blood cells), leukocytes (white blood cells), and thrombocytes (platelets).
Differentiate between plasma and formed elements: Plasma is the fluid part of blood that contains water, electrolytes, proteins, and other dissolved substances. Formed elements are the solid components, such as cells.
Recognize that serum is a component of plasma: Serum is the liquid that remains after blood has clotted, and it does not contain cells or clotting factors.
Conclude that erythrocytes are the correct answer: Erythrocytes are a type of formed element, as they are cells found in the blood, unlike serum and electrolytes, which are part of the plasma.
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