Chapter 18

Thrombocytes are more accurately called ________. a. platelets b. megakaryoblasts c. megakaryocytes d. clotting factors

a. platelets

Which of the following statements about blood is true? a. Blood is about 92% water. b. Blood is slightly more acidic than water. c. Blood is slightly more viscous than water. d. Blood is slightly more salty than seawater.

c. Blood is slightly more viscous than water.

A patient has been experiencing severe, persistent allergy symptoms that are reduced when she takes an antihistamine. Before the treatment, this patient was likely to have had increased activity of which leukocyte? a. natural killer cells b. monocytes c. basophils d. neutrophils

c. basophils

Interleukins are associated primarily with which of the following? a. production of various lymphocytes b. immune responses c. inflammation d. all of the above

d. all of the above

The production of healthy erythrocytes depends upon the availability of ______. a. copper b. zinc c. vitamin B12 d. copper, zinc, and vitamin B12

d. copper, zinc, and vitamin B12

Which of the following plasma proteins is not produced by the liver? a. fibrinogen b. alpha globulin c. beta globulin d. immunoglobulin

d. immunoglobulin

The process in which antibodies attach to antigens, causing the formation of masses of linked cells, is called____. a. agglutination b. sensitization c. coagulation d. hemolysis

a. agglutination

People with ABO blood type O ________. a. lack both antigens A and B on their erythrocytes b. have both antigens A and B on their erythrocytes c. are considered universal recipients d. have neither anti-A nor anti-B antibodies circulating in their blood plasma

a. lack both antigens A and B on their erythrocytes

Which of the formed elements arise from myeloid stem cells? a. B cells b. natural killer cells c. platelets d. None

c. platelets

The first step in hemostasis is ________. a. activation of the intrinsic pathway b. conversion of fibrinogen to fibrin c. vascular spasm d. activation of the common pathway

c. vascular spasm

Aging and damaged erythrocytes are removed from the circulation by ________. a. myeoblasts b. monocytes c. macrophages d. mast cells

c. macrophages

Which of the following statements about erythropoietin is true? a. It facilitates the proliferation and differentiation of the erythrocyte lineage. b. It is a hormone produced by the thyroid gland. c. It is a hemopoietic growth factor that prompts lymphoid stem cells to leave the bone marrow. d. Both a and b are true.

a. It facilitates the proliferation and differentiation of the erythrocyte lineage.

Which of the following statements about mature, circulating erythrocytes is true? a. They have no nucleus b. They are packed with mitochondria c. They survive for an average of 4 days d. All of the above

a. They have no nucleus

Which of the following statements about albumin is true? a. It draws water out of the blood vessels and into the body's tissues. b. it is the most abundant plasma protein. c. It is produced by specialized leukocytes called plasma cells. d. All of the above are true.

b. it is the most abundant plasma protein.

A patient has been suffering for 2 months with a chronic, watery diarrhea. A blood test is likely to reveal _____. a. anemia b. polycythemia c. a hematocrit below 35 % d. hypoxemia

b. polycythemia

Prothrombin is converted to thrombin during the ________. a. intrinsic pathway b. extrinsic pathway c. common pathway d. formation of the platelet plug

c. common pathway

T and B lymphocytes ________. a. are polymorphonuclear b. are involved with specific immune function c. proliferate excessively in leukopenia d. are most active against parasitic worms

b. are involved with specific immune function

A molecule of hemoglobin_________. a. is shaped like a biconcave disk packed almost entirely with iron b. contains four glycoprotein units studded with oxygen c. consists of four globin proteins, each bound to a molecule of heme d. can carry up to 120 molecules of oxygen

c. consists of four globin proteins, each bound to a molecule of heme

The process by which leukocytes squeeze through adjacent cells in a blood vessel wall is called ________. a. Cytoplasmic extending b. chemotaxis c. leukocytosis d. emigration

d. emigration

Hemophilia is characterized by ________. a. excessive production of platelets b. inadequate production of heparin c. excessive production of fibrinogen d. inadequate production of clotting factors

d. inadequate production of clotting factors