alleryStart learning →Blood is classified as a connective tissue. What serves as its extracellular matrix?
APlasma, the fluid part of blood
BSerum, left behind after clotting
CThe buffy coat of the sample
DHemoglobin inside the red cells
Answer & Solution
Correct answer: A. Plasma, the fluid part of blood
1. Every connective tissue has cellular elements sitting in an extracellular matrix.
2. In blood the cellular elements are the formed elements: erythrocytes, leukocytes and platelets.
3. The matrix is plasma, a fluid that is mostly water and that keeps the formed elements in suspension as they circulate.
4. Serum is plasma with the clotting factors already removed, so it is not the matrix of circulating blood.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.1 An Overview of Blood_
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