Question

23) Platelets are derived from d) Histiocytes e Megakarycytes 24) Major manifestations of theumatic fever include a) Arthritis b) Carditis c) Chorea d) Subcutaneous nodules e All of the above 25) Rheumatic fever is caused by. a) Alpha-hemolytic Strep. b) Beta-hemolytic Strep. d) Staphylococci e) Antistreptolysin-O 26) An elevated ASO (ASLO) titer in the serum is an indication of a) Positive throat infection by B-Strep b)- Positive A-Strep infection c) Frequent A-Strep infection in the past d) Positive endocarditis e) Frequent B-Strep infection of the past 27 Antibodies Streptolysin-0 (ASO ASLO) mainly attacks: a) Tricuspid valve b) Bicuspid (Mitral) valve c) Aortic valve d) Semilunar valve eAtrio-ventricular valve

Answer 1

1. Platelets are derived from :-

- correct option is (e) megakaryocytes.

Platelets are derived from megakaryocytes.

24. Major manifestation of rheumic fever include:-

- correct option is option (e) all of the above.

Rheumatic fever is manifested as -

- Arthritis ,

- Carditis more appropriately pancarditis involving all the three layer of heart like pericarditis , myocarditis , endocarditis.

- Chorea

- Subcutaneous nodules

25. Rheumatic fever is caused by :-

Answer - correct option is (b) Beta hemolytic streptococcus.

Explanation:- Rheumatic fever is caused by group A streptococcus , which are type of beta hemolytic streptococcus.

26. An elevated ASO titre in the serum is an indication of :-

Answer - the correct option should be (C) frequent A streptococcus infection in the past.

27. Antibodies streptolycin-O mainly attacks:-

Answer- correct option is (b) Bicuspid (mitral)valve.

Explanation:- in this disease mitral valve is virtually always involved. Tricuspid valve involvement is infrequent and the pulmonary valve is only rarely affected.

Hope you got your answer.