BIO120H1 Chapter Notes - Chapter 7: Coprophagia, Foregut, Protozoa
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BIO120H1 Full Course Notes
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7. 1 size imposes a fundamental constraint on the evolution of organisms animals range from 2-10ug to 100,000kg. Scaling is the predictable change in morphological and physical features. As the size of an organism increases, the surface area relative to the volume decreases , diffusion of oxygen is increasingly difficult. No point on the interior is more than a few mm from the surface. Total surface area is where oxygen can diffuse is greater. Larger animals use complex mechanisms such as lungs and blood vessels. Similar mechanisms works for exchange of materials, such as the digestive system. 7. 2 animals have various ways of acquiring energy and nutrients. Categorized by the type of plant material they eat. Has specialized bacteria and protozoa in digestive tracts to digest cellulose. Fermentation is the conversion of sugar to inorganic acids and alcohols. Ruminants have highly complex digestive system for cellulose. Produces fatty acids, major source of food energy.
