Blood Composition and Formed Elements

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Anatomy and Physiology II (with lab)

What is the blood volume of of an average-size adult male?

5-6 liters

What is the blood volume of an average-sized adult woman?

4-5 liters

What is the difference between bright red blood and dull-brick red blood?

The color of blood is bright red when oxygenated and a deep red-maroon color when deoxygenated.

Is the color of blood ever blue?

No, the color of blood always remains in the spectrum of red, but some people feel that blood can be a blue-red hue when blood is the least oxygenated.

What is the "part of blood" that helps determine the color of blood? What is the other influencing factor that helps determine the color of blood?

A protein pigment called hemoglobin (which has iron molecules in it) determines the color of blood because oxygen combines with the iron in hemoglobin which then causes the blood to rust and turn a red color. The other determining factor is oxygen since the color of blood varies with the amount of oxygen it is carrying.

What are the three "formed elements" in blood?

The three formed elements of blood are: white blood cells (leukocytes), red blood cells (erythrocytes) and platelets (thrombocytes ).

Which "formed element" in blood is a nucleated cell?

Leukocytes (white blood cells - WBCs) are nucleated cells that are formed in the bone marrow from the same stem cells as red blood cells.

Which is the most numerous blood element?

erythrocytes (red blood cells - RBCs)

What does it mean for a cell to be anucleate?

It means that the cell lacks a nucleus.

Name the formed element(s) that is/are anucleate?

Erythrocytes (red blood cells - RBCs) lack a nucleus, and platelets are cell fragments without a nucleus.

Which formed element is essentially a cell fragment?

Platelets are considered noncellular because they are essentially irregularly shaped cell fragments of multinucleate cells called megakaryocytes.

What is the ancestral cell of the platelet?

megakaryocyte

What is another term for platelet?

thrombocyte

What is the role of hemoglobin in the red blood cell?

Hemoglobin transports oxygen in the blood as well as a small amount of carbon dioxide.

What is it called when there is a decrease in the oxygen-carrying ability of the blood?

It is called anemia.

What does anemia result from?

Anemia can be the result of (1) a lower-than-normal number of RBCs, or (2) abnormal or deficient hemoglobin content in the RBCs.

What is the intercellular matrix of blood?

plasma

What is the primary component of plasma?

Plasma is 90% water.

What determines how well the erythrocytes are performing their role of oxygen transport?

the amount of hemoglobin in the bloodstream

What color is plasma when it is separated from the formed elements of blood?

Plasma is a clear, straw-colored fluid.

What constitutes a diagnosis of anemia in an adult?

An adult who has a hemoglobin content of less than 10g/100 ml of blood is diagnosed as having is diagnosed as having anemia.

How much blood does the body contain?

about 8% of the total body weight of an average-sized adult

How is the measurement of of the plasma and formed elements generally expressed?

as a percent of the whole blood volume with plasma accounting for 55% and the formed elements accounting for about 45% of the total blood volume.

Name the granular leukocytes.

basophil, neutrophil, and eosinophil

Name the nongranular leukocytes.

lymphocyte and monocyte

What factors cause blood volume to vary from individual to individual?

age, body type, sex, and method of measurement

What is the primary component of erythrocytes?

hemoglobin

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