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Question: 23 platelets are derived from a myelocytes b thrombocytes c...

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23) Platelets are derived from: a) Myelocytes b) Thrombocytes c) Leucocytes d) Histiocytes e) Megakarycytes Major manifestations of rheumatic fever include: a) Arthritis b) Carditis c) Chorea d) Subcutaneous nodules e) All of the above 24) Rheumatic fever is caused by: a) Ajpha-hemolytic Strep. b) Beta-hemolytic Strep. c) Hemophilus influenzae d) Staphylococci e) Antistreptolysin-O 25) 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 26) Antibodies Streptolysin-O (ASO/ASLO) mainly attacks: a) Tricuspid valve b) Bicuspid (Mitral) valve c) Aortic valve d) Semilunar valve c) Atrio-ventricular valve 27)

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