Ch 12 test

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

• 15%

• 30%

• 45%

• 60%

• 80%

Hematocrit is

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

• a disease.

• a clotting factor.

• the color of plasma.

• none of the above.

Blood is a type of epithelial tissue.

• True

• False

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

• white blood cells.

• red blood cells.

• platelets.

• macrophages.

• plasma cells.

Which of the following elements is included in hemoglobin molecules?

• Cobalt

• Copper

• Iron

• Iodine

• Calcium

The condition called cyanosis is caused by an increased blood concentration of

• deoxyhemoglobin

• oxyhemoglobin

• carbon dioxide

• carbon monoxide

• oxygen

Sickle cell disease, in which red blood cells contain abnormal hemoglobin, is caused by

• a lack of dietary iron

• a lack of intrinsic factor

• an excess of hemoglobin

• a mutation

• a virus

Which of the following is an agranulocyte?

• Basophil

• Eosinophil

• Monocyte

• Neutrophil

• Polymorphonuclear leukocyte

Which of the following usually accounts for the smallest percentage of leukocytes in a blood sample?

• Monocytes

• Eosinophils

• Basophils

• Lymphocytes

• Neutrophils

The most active phagocytic cells among the leukocytes are

• basophils and eosinophils.

• neutrophils and monocytes.

• lymphocytes and neutrophils.

• monocytes and lymphocytes.

• basophils and eosinophils.