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Flashcards in Hematology - Physiology Deck (56)
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1

What is the blood group of an individual with the A antigen on red blood cells and B antibody in plasma?

Group A

2

What is the blood group of an individual with the B antigen on red blood cells and A antibody in plasma?

Group B

3

What is the blood group of an individual with both A and B antigens on red blood cells?

Group AB (universal recipient)

4

What is the blood group of an individual with neither A nor B antigens on red blood cells and both A and B antibodies in plasma?

Group O (universal donor)

5

What is the blood type of an individual who is a universal recipient of blood cells?

Blood group AB; A and B antigen on red blood cells

6

What is the blood type of an individual who is a universal donor of blood products?

Blood group O; neither A nor B antigens on red blood cells

7

A patient receiving a blood transfusion suddenly develops symptoms of anaphylaxis, renal failure, and hypotension and has schistocytes on a smear; what is the likely cause?

Incompatible blood type transfusion

8

What happens when an Rh-negative mother is exposed to Rh-positive blood (for instance, during delivery)?

Exposure to Rh-positive blood (which has the Rho antigen) will result in the development of anti-Rh immunoglobulin G antibodies, which may complicate future pregnancies

9

Which class of antibodies are produced against the ABO blood groups?

Immunoglobulin M

10

Which class of antibodies are produced against Rh factor?

Immunoglobulin G

11

If a mother is blood type O and her fetus is blood type B, will the fetus be at risk for hemolytic disease of the newborn?

No; antibodies against ABO blood groups are immunoglobulin M class and do not cross the placenta

12

What happens when an Rh-negative mother with anti-Rh antibodies becomes pregnant with a child who is Rh positive?

Erythoblastosis fetalis; the anti-Rh immunoglobulin G crosses the placenta and causes hemolysis in the newborn

13

What part of the fibrinolytic system also activates the complement cascade by cleaving C3 to C3a?

Plasmin

14

Kallikrein links the coagulation cascade to the kinin cascade through its activation of _____ and to the fibrinolytic system through its activation of _____.

Bradykinin; plasminogen (to plasmin)

15

Name two reactions initiated by high-molecular-weight kininogen.

High-molecular-weight kininogen is the initial reagent in the kinin cascade and stimulates the coagulation cascade by interacting with factor XII

16

What does plasmin create when it interacts with fibrin clots?

Fibrin split products (fibrin degradation)

17

Once high-molecular-weight kininogen cleaves to form bradykinin, what are the effects of the kinin cascade?

Vasodilation, vascular permeability, and pain

18

What factor converts prokallikrein to kallikrein and factor XI to XIa?

Factor XIIa; it is thus involved in both the kinin cascade and the coagulation cascade

19

Which coagulation factors are specific to the intrinsic coagulation pathway?

Factor XII, factor XI, factor IX, and factor VIII

20

Which coagulation factors are specific to the extrinsic coagulation pathway?

Factor VII and tissue factor (thromboplastin)

21

Which coagulation factors are common to both the intrinsic and extrinsic coagulation pathways?

Factor X, factor V, factor II (prothrombin), and factor XIII

22

What is the end result of the coagulation cascade?

The conversion of fibrinogen into fibrin to form a fibrin mesh that will stabilize the platelet plug

23

Which reactions in the coagulation cascade require calcium and a phospholipid surface as cofactors?

The conversion of factor IX to IXa, VII to VIIa, X to Xa, and II to IIa

24

What are two stimuli for the conversion of factor X to factor Xa?

Activated factor VIIa, or factor IXa with factor VIIIa as a cofactor; this is where the intrinsic and extrinsic pathways converge

25

Which four reactions is thrombin involved in?

Thrombin (IIa) cleaves fibrinogen into fibrin monomers, activates factor XIII to help stabilize and cross-link the fibrin mesh, and activates both factor VIII and factor V

26

What ion does factor XIII require to stabilize the fibrin mesh?

Calcium

27

Why do susceptible individuals develop angioedema when taking an angiotensin-converting enzyme inhibitor?

Angiotensin-converting enzyme deactivates bradykinin; blocking this results in the unopposed activation of bradykinin by kallikrein

28

Name two initiators of the intrinsic coagulation pathway.

Factor XII is converted to XIIa in the presence of endothelial damage (collagen basement membrane and activated platelets) and by high-molecular-weight kininogen

29

What disorder results from a deficiency of factor VIII?

Hemophilia A

30

What disorder results from a deficiency of factor IX?

Hemophilia B