Biology › Exchange surfaces and gas exchange

Exchange surfaces and gas exchange

Unit B07 · 3 lessons published so far.

• Surface area to volume ratio: why size limits diffusion
  Surface area to volume ratio and how it falls as an organism gets larger, the effect of shape as well as size, Fick's law as a proportionality, why…
• Lungs: seventy square metres, folded into a chest
  The route from trachea to alveolus and the cartilage, ciliated epithelium, goblet cells, smooth muscle and elastic fibres found at each level, the…
• Three other answers: tracheae, gills and stomata
  The insect tracheal system from spiracle to tracheole and how tracheal fluid moves during activity, the structure of a bony fish gill and why…

Practical work that lands here

• Dissection and biological drawing