True statements w/ regard to concentration effect include:

(1) concentration effect means the inspired concentration of a given gas may influence both the alveolar concentration reached & the rate @ which that concentration is reached

(2) concentration effect on a second gas when it is given concomitantly is termed the second gas effect

(3) two factors in the concentration effect are the effect of concentrating & the effect of augmenting the inspired ventilation

(4) concentration effect could be thought of as effectively increasing solubility with an increased concentration of inspired gas

Any or all answers may be correct, folks!:hmmmm: