Describe the changes shown in Fig. 2.1 from 1980 to 2000.
The number of reported TB cases in the USA between 1984 and 1992 may have been influenced by an increase in the number of people infected with HIV. Explain how an increase in the number of people infected with HIV could have changed the number of TB cases.
Mycobacterium tuberculosis is a bacterium species that causes TB. Strains of M. tuberculosis have developed resistance to some of the antibiotics used to treat the disease. State two ways in which the effect of antibiotic resistance can be reduced.
The cartilage in the bronchi can be damaged in some people with TB. Suggest the effect that damage to the cartilage may have on the bronchi.
Table 2.1 shows four types of cell and three structures in the gas exchange system. Complete Table 2.1 to show where each cell type is found within each structure of the gas exchange system. Use a tick ($\checkmark$) if the cell type is present in the structure and a cross ($\times$) if it is absent. Ensure that every box has either a tick ($\checkmark$) or a cross ($\times$).