Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Question
Chapter 42, Problem 1PL
Summary Introduction

Introduction:Hematocrit, hemoglobin content, coagulation and cholesterol are the tests commonly used to determine the blood composition. The obtained values are compared with the normal values to identifying various disease conditions.

Expert Solution & Answer
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Answer to Problem 1PL

Correct answer:

The correct answer is option (b) Hematocrit.

Explanation of Solution

Explanation/justification for the correct answer:

Option (b) Hematocrit. The hematocrit is the percentage of blood volume composed of red blood cells. When heparinized blood sample left undisturbed the heavier cellular component settles to the bottom of the tube. The red blood cells settle at the bottom as red layer is called compacted red blood cells. The percentage of compacted red blood cells in the blood sample is called hematocrit.So, the correct answer is option (b).

Explanation for incorrect answer:

Option (a) Hemoglobin. Hemoglobin is responsible for the binding of oxygen in red blood cells. Molecules of the protein hemoglobin compose about one third of the volume within red blood cell. The hemoglobin molecule is composed of four protein subunits, each containing a heme molecule with an atom of iron. Each iron binds to one oxygen molecule. As a result each hemoglobin molecule can bind to four oxygen molecule.So, this is an incorrect option.

Option (c) Buffy coat.When heparinized blood sample left undisturbed the heavier cellular component settles to the bottom of the tube. The red blood cells settle at the bottom as red layer is called compacted red blood cells.A thin, whitish layer known as buffy coat, forms on the top of compacted red blood celllayer. This contains the white blood cells and the platelets. So, this is an incorrect answer.

Option (d) Coagulation.The coagulation mechanism involves a series of chain reaction that results in a blood clot. The final stage of blood clot formation occurs when thrombin converts a soluble plasma protein called fibrinogen into insoluble threads of fibrin. The fibrin mesh traps the cellular components of the blood, stopping the blood loss. So, this is an incorrect answer.

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Students have asked these similar questions
The hematocrit is a measure of a. water concentration in the plasma. b. the percentage of formed elements in the blood. c. the number of platelets in the blood. d. antibody concentration in the plasma.
A person with a genetic defect which results in the synthesis of an insufficient amount of the alpha chain of hemoglobin is said to have which disease? A) alpha thalassemia b)   beta thalassemia   c)  pernicious anemia   d)  Crohn’s disease
What does the term hematocrit mean? a) The number of white blood cells in the blood b) The number of red blood cells in the blood c) The percentage of red blood cells in the blood d) The critical number of red blood cells we need to survive
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