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Questions and Answers
The heavier components of blood are found at the top of a centrifuged sample.
The heavier components of blood are found at the top of a centrifuged sample.
False (B)
The layer containing leukocytes and platelets is called the buffy coat.
The layer containing leukocytes and platelets is called the buffy coat.
True (A)
Blood is a type of muscle tissue.
Blood is a type of muscle tissue.
False (B)
The red blood cell layer constitutes 90% of the total volume of a blood sample.
The red blood cell layer constitutes 90% of the total volume of a blood sample.
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Spinning a blood sample in a centrifuge separates it into three distinct layers.
Spinning a blood sample in a centrifuge separates it into three distinct layers.
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Study Notes
Blood Composition
- Blood is a specialized type of connective tissue consisting of living cells (formed elements) suspended in a nonliving fluid matrix called plasma.
Blood Sample Layers
- When spun in a centrifuge, a blood sample separates into layers based on density, with the heaviest at the bottom and the least dense at the top.
- The three layers that form are:
- Red blood cells (RBCs or erythrocytes) layer, making up 45% of the total blood sample volume (also known as packed cell volume or hematocrit).
- Buffy coat, a thin, whitish layer at the RBC-plasma junction, containing leukocytes and platelets.
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