1. Figure 20.4: Lymph node, p. 778. (a) Follicles Medullary cords Medullary sinuses B & T Cells, Plasma cells Macrophages Dividing B cells

2. Figure 20.6

3. Figure 20.5: Lymphoid organs, p. 779. Tonsils (in pharyngeal region) Thymus (in thorax; most active during youth) Spleen (curves around left side of stomach) Peyer’s patches (in intestine) Appendix

4. Figure 20.8 Histology of the palatine tonsil. Pharyngeal tonsil Palatine tonsil Lingual tonsil

5. Figure 22.1 The major respiratory organs in relation to surrounding structures. Nasal cavity Nostril Oral cavity Pharynx Larynx Trachea Carina of trachea Left main (primary) bronchus Right main (primary) bronchus Right lung Left lung Diaphragm

6. Figure 22.7: Conducting zone passages, p. 840. Trachea Superior lobe of right lung Middle lobe of right lung Inferior lobe of right lung Superior lobe of left lung Left main (primary) bronchus Lobar (secondary) bronchus Segmental (tertiary) bronchus Inferior lobe of left lung

7. Figure 22.8: Respiratory zone structures, p. 841. (a) (b) Alveolar duct Alveolar duct Alveoli Alveolar sac Alveolar pores Respiratory bronchioles Terminal bronchiole Alveolar duct Respiratory bronchiole Alveoli Alveolar sac