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    				| 1. | Which two of the following changes ususally tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?A. 2 and 3B. 3 and 4C. 1 and 4D. 1 and 2 | 
| Answer» Correct Answer - A When a person moves to higher altitudes wthe `po_(2)` and total atmospheric pressure decrease hypoxia stimulated the juxtaglomerular cells of the kideny to release erythropoietin ormone which stimulates erythropoesis in bone marrow causing polycythemia (increase in RBCs production) Hypoxia wil also increase breathing rate. Initially the size of RBCs will also increase but with increase in number of RBCs the size of RBCs becomes normal. | |