128 
calculated for dry air, 14 
constancy of, 8, 10 
during apnoea, 9, 22 
during rest, 27 
during severe exertion, 27, 
41 
effect of acids on, 35 
effect of alkalis on, 35 
effect of diabetes on, 35 
effect of diet on, 35 
effect of hyperpnoea on, 42 
effect of partially ob- 
structed breathing on, 13 
effect on breathing, 8, 9 
in oxygen deficiency, 27 
percentage, 8, 9, 13 
pressure and percentage at 
various barometric pres- 
sures, 14 
regulation during exercise, 
10 
regulation of breathing, 7, 
9, 11, 14 
relation of oxygen alveolar 
pressure to, 49 
relation to barometric pres- 
sure, 14 
Carbon dioxide in blood, and 
hydrogen ion concentra- 
tion, 37 
dissociation of, 31 
during apnoea, 9, 22 
indirect regulation by en- 
dothelial cells, 41, 42 
regulation of breathing by, 
27, 42 
INDEX 
regulation of venous con- 
striction by, 74 
regulation of venous pres- 
sure by, 74, 75 
Carbon dioxide deficiency, in 
“shock,” 15 
symptoms of, 16 
Carbon dioxide excess, effect 
on breathing during ex- 
ertion, 19 
symptoms of, 16 
Carbon dioxide percentage, 
in alveoli, 8, 9, 13 
Carbon dioxide pressure, and 
hydrogen-ion concentra- 
tion of blood, 37 
at different altitudes, 49 
effect of increased oxygen 
pressure on, 49 
effect on dissociation curve 
of oxy-haemoglobin, 30, 
31 
regulation of breathing, 34 
relation to alveolar oxygen 
pressure, 49 
Carbon monoxide, combina- 
tion with haemoglobin, 
45 
method of determining 
oxygen pressure in blood 
leaving lungs with, 54 
Carbon monoxide, saturation 
of blood with mixture of 
oxygen and, 53, 54 
test for presence of, 46 
Carbon monoxide poisoning, 
cause of, 45 
