251. Which of the following is not a cause of secondary polycythemia ?
A. High Altitude
B. Myeloproliferative changes
C. Pheochromocytoma
D. Cerebellar hemangioblastoma
252. Which of the following clotting factor is involved only in extrinsic pathway ?
A. IX
B. X
C. II
D. VII
253. Plasma colloid osmotic pressure is due to________________?
A. Albumin
B. Globulin
C. Fibrinogen
D. Collagen
254. Decreased MCHC is found in_____________?
A. Microcytic hypochromic anemia
B. Megaloblastic anemia
C. Sideroblastic anemia
D. Vit B12 deficiency
255. True statement regarding hematopoiesis includes______________?
A. Spleen plays a major role in adults (in lymphopoiesis )
B. Committed stem cells differentiates into only one cell type
C. RES plays a role
D. None
256. A reliable screening test for platelet function is_______________?
A. CT
B. PT
C. Thrombin
D. Clot retraction time
257. CO2 is transported in plasma as_____________?
A. Bicarbonate
B. Carbamino compounds
C. Dissolved
D. CO
258. Immune complexes are removed from blood by _____________?
A. B cell
B. Basophil
C. Plasma cell
D. Kupffer cell
259. Thromboxane is produced mainly by _______________?
A. Liver
B. Platelets
C. Damaged tissue
D. Vascular endothelium
260. Increased blood viscosity and slow circulation causes______________?
A. RBC rouleaux formation
B. Increased plasma skimming
C. Increased number of RBC in capillaries
D. None