GMDC BLOOD MCQ 1 11 Quiz 1 / 20 What is the SECOND step in the three phases of haemostasis listed below? The platelet phase The vascular phase The intrinsic pathway The extrinsic pathway The three phases are: vascular phase, platelet phase, coagulation phase (which, in turn has 3 steps). The three phases are: vascular phase, platelet phase, coagulation phase (which, in turn has 3 steps). 2 / 20 Which type of white blood cell is responsible for engulfing pathogens during phagocytosis? neutrophil erythrocyte thrombocyte basophil Neutrophils are microphages thats phagocytes of bacteria. Thrombocytes and erythrocytes are not wbc. Neutrophils are microphages thats phagocytes of bacteria. Thrombocytes and erythrocytes are not wbc. 3 / 20 What is found in blood serum that is also in blood plasma? plasma proteins blood cells clotting factors platelets Plasma proteins (except fibrinogen) are in plasma and in serum. Serum = plasma minus the clotting factors. Blood cells and platelets are not in plasma. Plasma proteins (except fibrinogen) are in plasma and in serum. Serum = plasma minus the clotting factors. Blood cells and platelets are not in plasma. 4 / 20 What type of blood may a patient with blood type Bpositive be infused with? Any blood that is positive for rhesus antigen D negative for antigen A negative for antigen B negative for rhesus antigen D A patient that is Bpositive may receive Bpositive, Bnegative, Opositive or Onegative blood because those types do not have antigen A in the plasma. A patient that is Bpositive may receive Bpositive, Bnegative, Opositive or Onegative blood because those types do not have antigen A in the plasma. 5 / 20 Which individuals can receive any type of blood and are considered universal recipients? ABpositive Apositive Onegative Bnegative People with ABpositive blood do not have agglutinins (antibodies) against A, B, or D in their plasma. Hence can receive any blood without causing the rbc in the donated blood to clump People with ABpositive blood do not have agglutinins (antibodies) against A, B, or D in their plasma. Hence can receive any blood without causing the rbc in the donated blood to clump 6 / 20 What is the first process that occurs after a blood vessel is damaged? haemolysis platelet plug formation vasoconstriction coagulation Almost immediately (within 2 secs) after a blood vessel is cut the vessel walls contract in a spasm to slow the flow of blood (vessel diameter decreases). Almost immediately (within 2 secs) after a blood vessel is cut the vessel walls contract in a spasm to slow the flow of blood (vessel diameter decreases). 7 / 20 Which is the LEAST common type of white blood cell? thrombocyte neutrophil lymphocyte basophil Less than 1 percent of wbc are basophils. Neutrophils are the most common. Thrombocytes are not wbc Less than 1 percent of wbc are basophils. Neutrophils are the most common. Thrombocytes are not wbc 8 / 20 In the haemostasis process, what forms as a result of the extrinsic and intrinsic pathways? prothrombinase a platelet plug fibrin thrombin The extrinsic and intrinsic pathways form prothrombinase (also called prothrombin activator) from factor X. The extrinsic and intrinsic pathways form prothrombinase (also called prothrombin activator) from factor X. 9 / 20 Which is the most abundant plasma protein? haemoglobin mitochondria alpha- and beta- globulin albumin About 58 percent of plasma proteins are albumins. Haemoglobin is a protein but it is contained within the rbc. About 58 percent of plasma proteins are albumins. Haemoglobin is a protein but it is contained within the rbc. 10 / 20 What is the term formed elements used to mean in a description of blood? blood serum blood plasma the clotting factors in blood white blood cells, red blood cells and platelets Formed elements are the non-liquid or solute parts of the blood. Formed elements are the non-liquid or solute parts of the blood. 11 / 20 What are red blood cells primarily composed of? alpha- and beta- globulins albumin haemoglobin mitochondria About one third of the mass of a rbc is haemoglobin.Other choices are plasma proteins and are not in rbc. About one third of the mass of a rbc is haemoglobin.Other choices are plasma proteins and are not in rbc. 12 / 20 Which of the following is NOT a macrophage? Dendrocyte Megakaryocyte Kupffer cell Monocyte A megakaryocyte is the cell that produces the membrane covered cell fragments known as platelets. It is not a macrophage. A dendrocyte is also known as a Langerhans cell or a granstein cell. A megakaryocyte is the cell that produces the membrane covered cell fragments known as platelets. It is not a macrophage. A dendrocyte is also known as a Langerhans cell or a granstein cell. 13 / 20 Which enzyme converts fibrinogen to fibrin? thrombin renin serotonin secretin Thrombin is the enzyme. It is not present until prothrombinase converts prothrombin to thrombin. Thrombin is the enzyme. It is not present until prothrombinase converts prothrombin to thrombin. 14 / 20 Which blood cells are involved in protecting the body from pathogens and foreign cells? platelets haemoglobin leucocytes erythrocytes Leucocytes (white blood cells) include NK (natural killer), T and B lymphocytes and macrophages and microphages. Leucocytes (white blood cells) include NK (natural killer), T and B lymphocytes and macrophages and microphages. 15 / 20 Which characteristic of blood refers to the concentration of solutes? salinity osmolality pH viscosity Osmolality is the number of osmoles (osmol) of solute per kilogram of solvent. (osmolarity (with an r) is defined as the number of osmoles of solute per litre of solution). Osmolality is the number of osmoles (osmol) of solute per kilogram of solvent. (osmolarity (with an r) is defined as the number of osmoles of solute per litre of solution). 16 / 20 The blood group known as the ABO system is based on the presence of what proteins on blood cells? immunoglobulins antibodies agglutinins antigens Antigens are on the membrane of the rbc. The other three terms all describe the same thing Antigens are on the membrane of the rbc. The other three terms all describe the same thing 17 / 20 In haemostasis, which molecule polymerises to become the insoluble blood clot? thrombin plasmin factor X fibrin Fibrin is a monomer that polymerises to form a soft clot, then crosslinking between fibrin produces a stable, web-like hard clot. Fibrin is a monomer that polymerises to form a soft clot, then crosslinking between fibrin produces a stable, web-like hard clot. 18 / 20 What does Rhesus positive refer to? The final factor involved in blood clotting A deficiency of Factor VIII that results in haemophilia The presence of antigen D on the surface of red blood cells The presence of the rhesus antibody/agglutinin in the blood Rh factor, Rh positive and Rh negative refer to the D antigen only. If the antigen is present on your rbc, you are called Rh-positive (you have the Rh factor). Rh factor, Rh positive and Rh negative refer to the D antigen only. If the antigen is present on your rbc, you are called Rh-positive (you have the Rh factor). 19 / 20 In the process of haemostasis, which phase involves the intrinsic and extrinsic pathways? the platelet phase the coagulation phase the clot lysis phase the vascular phase The clotting (coagulation phase) has these two pathways. The clotting (coagulation phase) has these two pathways. 20 / 20 To which of the following would the term white cell NOT be applied? lymphocyte erythrocyte monocyte leucocyte An erythrocyte is a red blood cell An erythrocyte is a red blood cell Your score is Send feedback