Finish Table 5.1 by naming the part of the human gas exchange system that performs each role.
Describe how changes in the carbon dioxide concentration of the air affect the rate and depth of breathing, as shown in Fig. 5.1.
Complete the sentences by inserting the correct word or phrase in each gap. During physical activity the concentration of carbon dioxide in the blood increases. This happens because the rate of [BLANK] rises in the [BLANK] inside muscle cells. The rise in the concentration of carbon dioxide in the blood is detected by the [BLANK], which increases both the rate and depth of breathing so that carbon dioxide can be [BLANK] from the body. This matters because carbon dioxide is a [BLANK] substance and can cause harm if it accumulates.