Polycythaemia is caused by A. Lung disease which causes a fall in oxy

1.	Polycythaemia is caused by A. Lung disease which causes a fall in oxygen saturation in arterial blood. B. Heart disease which causes a right to left shunt.C. Chronic renal failure. D. Pregnancy. E. High doses of vitamin B12.
Answer» A. True A fall in the O₂ content of arterial blood stimulates production of erythropoietin. B. True This also reduces the oxygen content of arterial blood. C. False Anaemia is common in chronic renal failure due to damage to the erythropoietin producing cells. D. False The increase in plasma volume causes a fall in red cell count. E. False This prevents megaloblastic anaemia but does not raise red cell concentration above normal.

Polycythaemia is caused by A. Lung disease which causes a fall in oxygen saturation in arterial blood. B. Heart disease which causes a right to left shunt.C. Chronic renal failure. D. Pregnancy. E. High doses of vitamin B12.

Answer»

A. True A fall in the O₂ content of arterial blood stimulates production of erythropoietin.

B. True This also reduces the oxygen content of arterial blood.

C. False Anaemia is common in chronic renal failure due to damage to the erythropoietin producing cells.

D. False The increase in plasma volume causes a fall in red cell count.

E. False This prevents megaloblastic anaemia but does not raise red cell concentration above normal.

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Polycythaemia is caused by A. Lung disease which causes a fall in oxygen saturation in arterial blood. B. Heart disease which causes a right to left shunt.C. Chronic renal failure. D. Pregnancy. E. High doses of vitamin B12.

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