The document describes the features of the mammalian lung that enable efficient gas exchange. It discusses the alveolus as an efficient exchange surface due to diffusion of oxygen and carbon dioxide. It also outlines the distribution of cartilage, cilia, goblet cells, smooth muscle, and elastic fibers in the trachea, bronchi, bronchioles, and alveoli and their functions in facilitating gas exchange. Diagrams and photographs are provided to illustrate these structures and distributions.

1. Lung Dissection
(b) describe the features of an efficient exchange surface, with
reference to diffusion of oxygen and carbon dioxide across an
alveolus;
(c) describe the features of the mammalian lung that adapt it to
efficient gaseous exchange;
(d) describe, with the aid of diagrams and
photographs, the distribution of cartilage,
ciliated epithelium, goblet cells, smooth
muscle and elastic fibres in the trachea,
bronchi, bronchioles and alveoli of the
mammalian gaseous exchange system;
(e) describe the functions of cartilage, cilia,
goblet cells, smooth muscle and elastic fibres in the mammalian
gaseous exchange
system;

2. Cat lung
• https://www.youtube.com/watch?v=wwMUrc
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