Which two of the following changes (a - d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
1. Enhance in red blood cell size
2. Enhance in red blood cell production
3. Enhance breathing rate
4. Enhance in thrombocyte count Changes occurring are :
(1) (b) and (c) (2) (c) and (d) (3) (a) and (d) (4) (a) and (b)
Enhance in red blood cell size