![]() In order for diffusion to be a feasible means of providing oxygen to the cell, the rate of oxygen uptake must match the rate of diffusion across the membrane. ![]() ![]() Diffusion is a slow, passive transport process. In unicellular organisms, diffusion across the cell membrane is sufficient for supplying oxygen to the cell ( Figure 20.2). As animal size increases, diffusion distances increase and the ratio of surface area to volume drops. The complexity of the respiratory system is correlated with the size of the organism. The environment in which the animal lives greatly determines how an animal respires. Along the evolutionary tree, different organisms have devised different means of obtaining oxygen from the surrounding atmosphere. The main structures of the human respiratory system are the nasal cavity, the trachea, and lungs.Īll aerobic organisms require oxygen to carry out their metabolic functions. The primary function of the respiratory system is to deliver oxygen to the cells of the body’s tissues and remove carbon dioxide, a cell waste product. Explain how the lungs are protected from particulate matter.Describe the passage of air from the outside environment to the lungs.
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