Kahlia was given antibiotics and told to rest. Bored by spending all day resting, Kahlia decided to learn more about her respiratory system. Select all statements that are true of the respiratory system. View Available Hint(s) Kahlia was given antibiotics and told to rest. Bored by spending all day resting, Kahlia decided to learn more about her respiratory system. Select all statements that are true of the respiratory system. The alveoli have a simple squamous epithelium to allow for diffusion of oxygen and carbon dioxide across the respiratory membrane. All structures of the conducting and respiratory zone are lined by a serous membrane. Mucus-secreting cells are found throughout the structures of the conducting and respiratory zone. Both the alveolar wall and capillary wall contribute to the respiratory membrane. All structures of the respiratory system have cilia to move mucus.