EBIO 1220 Study Guide - Midterm Guide: Body Surface Area, Small Intestine, Microvillus
6 Mar 2017
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Body surface area increases with square of body length, but volume/mass increases with the cube of body length. As you get bigger your sa increases, but your volume increases faster (to the cube while sa increases to the square). As you get larger you get much heavier. Sa:v ratio is getting smaller and you get bigger. As an animal gets bigger, what happens to the following responses (assume all endotherms): V increases (by more than sa) Ability to fly decreases (becomes harder to fly as weight increases) Risk of freezing to death decreases. Ability to diffuse oxygen through surface decreases. Metabolic demand per unit mass decreases. Clicker question which of the following sets of organisms (1 big cube or 10 small cubes) would consume more food (in total): the 10 small cubes. It energetically expensive to be an endotherm. Energetic demand per unit mass drops as sa:v ratio decreases. Villi and microvilli trying to absorb nutrients, products from food.
