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)?
(a) | Increase in red blood cell size |
(b) | Increase in red blood cell production |
(c) | Increased breathing rate |
(d) | Increase in thrombocyte count |
Changes occurring are:
1. (b) and (c)
2. (c) and (d)
3. (a) and (d)
4. (a) and (b)
Increased asthmatic attacks in certain seasons are related to:
1. hot and humid environment
2. eating fruits preserved in tin containers
3. inhalation of seasonal pollen
4. low-temperature