Ch 40 – Animal Form & Function. Form & function. Evolution of Animal size & shape Constrained by physical forces Convergent evolution i.e. fusiform shape for aquatic animals. Seal. Penguin. Exchange with Environment. Mouth. Gastrovascular cavity.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
(a) Single cell
(b) Two layers of cells
Advantages of a complex body:
Better able to deal with environmental changes
Countercurrent heat exchange – in many birds & mammals, also sharks, dolphins
Metabolic rate called the hypothalamusis the amount of energy an animal uses in a unit of time
How can metabolic rate be measured?
Influences on metabolic rate called the hypothalamus
Size – rate is proportional to body mass, smaller animals have higher metabolic rate per gram than larger animals
Reproduction – high energy cost
strategies: seasonal reproduction,
life history strategy – i.e. diapause (in insects)