Which of the following changes usually tends | vedclass

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(A) When a person moves to high altitudes,the partial pressure of oxygen $(pO_2)$ and total atmospheric pressure decrease.This condition,known as hypo

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$I$ and $II$

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(A) When a person moves to high altitudes,the partial pressure of oxygen $(pO_2)$ and total atmospheric pressure decrease.This condition,known as hypoxia,stimulates the juxtaglomerular cells of the kidney to release the hormone erythropoietin.Erythropoietin stimulates erythropoiesis (the production of red blood cells) in the bone marrow,leading to polycythemia (an increase in $RBC$ count).Furthermore,the body compensates for the low oxygen availability by increasing the breathing rate to intake more oxygen.Therefore,both increased breathing rate $(I)$ and increased $RBC$ production $(II)$ occur.

Which of the following changes usually tends to occur in plain dwellers when they move to high altitudes?
$I.$ Increased breathing rate
$II.$ Increased $RBC$ production
$III.$ Increased $WBC$ production
$IV.$ Increased thrombocyte count
Choose the correct option.

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Which of the following changes usually tends to occur in plain dwellers when they move to high altitudes?$I.$ Increased breathing rate$II.$ Increased $RBC$ production$III.$ Increased $WBC$ production$IV.$ Increased thrombocyte countChoose the correct option.