18Gas ExchangeMedium1 markWhat causes a bigger volume of air to be inspired during one breath when exercising?AA decreased carbon dioxide concentration in the blood is detected by the brain, which leads to an increased contraction of the internal intercostal muscles.BA decreased carbon dioxide concentration in the blood is detected by the brain, which leads to an increased contraction of the external intercostal muscles.CAn increased carbon dioxide concentration in the blood is detected by the brain, which leads to an increased contraction of the internal intercostal muscles.DAn increased carbon dioxide concentration in the blood is detected by the brain, which leads to an increased contraction of the external intercostal muscles.Grade answerGrading criteria