When you hold your breath, which of the following
gas changes in blood would first lead to the urge to
breathe?
(a) Falling CO2 concentration
(b) Rising CO2 and falling O2 concentration
(c) Falling O2 concentration
(d) Rising CO2 concentration
gas changes in blood would first lead to the urge to
breathe?
(a) Falling CO2 concentration
(b) Rising CO2 and falling O2 concentration
(c) Falling O2 concentration
(d) Rising CO2 concentration