GMDC BLOOD MCQ 1 5 Quiz 1 / 20 What are red blood cells primarily composed of? haemoglobin albumin alpha- and beta- globulins 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. 2 / 20 Which type of white blood cell is responsible for engulfing pathogens during phagocytosis? basophil thrombocyte neutrophil erythrocyte 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 Which of the following is NOT a macrophage? Dendrocyte Monocyte Megakaryocyte Kupffer 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. 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. 4 / 20 Which is the LEAST common type of white blood cell? thrombocyte lymphocyte neutrophil 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 5 / 20 What type of blood may a patient with blood type Bpositive be infused with? Any blood that is negative for rhesus antigen D negative for antigen B negative for antigen A positive 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. 6 / 20 What is found in blood serum that is also in blood plasma? plasma proteins blood cells platelets clotting factors 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. 7 / 20 Which characteristic of blood refers to the concentration of solutes? viscosity pH osmolality salinity 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). 8 / 20 What is the SECOND step in the three phases of haemostasis listed below? The vascular phase The platelet 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). 9 / 20 The blood group known as the ABO system is based on the presence of what proteins on blood cells? antibodies immunoglobulins antigens agglutinins 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 10 / 20 Which individuals can receive any type of blood and are considered universal recipients? Bnegative Onegative ABpositive Apositive 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 11 / 20 What is the first process that occurs after a blood vessel is damaged? coagulation haemolysis vasoconstriction platelet plug formation 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). 12 / 20 Which blood cells are involved in protecting the body from pathogens and foreign cells? haemoglobin leucocytes erythrocytes platelets 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. 13 / 20 What is the term formed elements used to mean in a description of blood? blood plasma white blood cells, red blood cells and platelets the clotting factors in blood blood serum Formed elements are the non-liquid or solute parts of the blood. Formed elements are the non-liquid or solute parts of the blood. 14 / 20 In the process of haemostasis, which phase involves the intrinsic and extrinsic pathways? the clot lysis phase the coagulation phase the vascular phase the platelet phase The clotting (coagulation phase) has these two pathways. The clotting (coagulation phase) has these two pathways. 15 / 20 To which of the following would the term white cell NOT be applied? monocyte erythrocyte leucocyte lymphocyte An erythrocyte is a red blood cell An erythrocyte is a red blood cell 16 / 20 Which enzyme converts fibrinogen to fibrin? serotonin secretin thrombin renin 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. 17 / 20 Which is the most abundant plasma protein? haemoglobin mitochondria albumin alpha- and beta- globulin 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. 18 / 20 What does Rhesus positive refer to? The presence of the rhesus antibody/agglutinin in the blood A deficiency of Factor VIII that results in haemophilia The final factor involved in blood clotting The presence of antigen D on the surface of red blood cells 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 haemostasis process, what forms as a result of the extrinsic and intrinsic pathways? a platelet plug prothrombinase thrombin fibrin 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. 20 / 20 In haemostasis, which molecule polymerises to become the insoluble blood clot? thrombin fibrin factor X plasmin 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. Your score is Send feedback