EBIO 1220 Study Guide - Final Guide: Cecum, Herbivore, Thermoregulation
30 Oct 2014
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Chapter 40: basic principles of animal form and function. Physical laws limit body shape and function. Surface area: volume ratio: dictates important properties such as size, temperature, respiration, and circulation, body surface area= (length)2, body mass= (length)3, example: 16 cubes: sa=40; v=16: sa: v ratio goes down as the animal gets bigger. B-rated horror movies giant ants, spiders, wasps, moths : not possible: sa: v ratio. Limbs couldn"t possibly hold the weight of the giant insects. Physical form effects exchange with the environment: amoeba (small, one-two celled organisms): uses diffusion this is enough to exchange with environment sufficiently, complex organisms: added adaptations. Digestive systems, circulatory system folding and branching to increase surface area. Expensive in energy, but offers protection, and ability to live on land and achieve a greater size. Why is it good to maximize sa: v ratio: increase the exchange surface, obtain/expel something.
