Anatomy & Physiology - Blood

The percentage of red blood cells in a sample of human blood is normally about

• 15%.

• 45%.

• 30%.

• 60%.

Hematocrit is

• the percent of red blood cells in a blood sample.

• a disease.

• the color of plasma.

• a clotting factor.

"Formed elements" are

• blood and lymph.

• sodium and potassium.

• serum and plasma.

• blood cells and platelets.

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Blood volume varies with

• body size.

• all of the answers are correct.

• amount of adipose tissue.

• changes in electrolyte and fluid concentrations.

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The biconcave cells in blood that lack nuclei when they are mature are the

• macrophages.

• white blood cells.

• platelets.

• red blood cells.

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Which of the following is an agranulocyte?

• A basophil

• A neutrophil

• An eosinophil

• A monocyte

The normal white blood cell count is

• 5,000,000-10,000,000 cells per microliter of blood.

• 500-1,00 cells per microliter of blood.

• 45,000-100,000 cells per microliter of blood.

• 4,500-10,000 cells per microliter of blood.

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Platelets are best described as

• lymphoid cells.

• fragments of cells.

• giant, multinucleated cells.

• immature leukocytes.

Which is the correct sequence for differentiation of a red blood cell?

• Hematopoietic stem cell, erythrocyte, hematoblast, erythroblast

• Hematopoietic stem cell, erythroblast, reticulocyte, erythrocyte

• Hematopoietic stem cell, erythroblast, erythrocyte, reticulocyte

• Hematopoietic stem cell, hemocytoblast, erythrocyte, erythroblast

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A primary function of lymphocytes is to

• release substances that initiate blood clots.

• produce enzymes that dissolve blood clots.

• phagocytize damaged cells.

• act against foreign substances.