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### 15 Cards in this Set

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 what is the evolutionary trend? there haas been an evolutionary trend toward larger size. What does it mean to be geometriclly similar? corresponding sides are in a constant ratio and corresponding angles are equal What is Isometry? objects that vary in size but not shape. they are geometrically similar. SA:volume varies with size. an animal with a 6/1 SA:volume couldn't be a endotherm because it would lose too much heat. What is allometry? Objects that vary in size and shape or proportions. why can't a the lenght/mass be graphed linear? to big of a line so graph on a log axis(the slope of the line is an exponent) What is considered isometric? a equals 3 human adults - isometrir or allometric? isometric how do human grow - iosmetric or allometric? allometric how does skeletal mass vary - isometrc or allometric? allometrically a = 3.25 -the bigger you are, the more skeltal mass you need. a bigger organism needs a bigger skeleton to deal with the stressed on earth. puts a limit on size becuase the largetr the elepehant, the bigger the skeleton. What about skeletal mass in aquatic vertebrate? - isometric or allometric isometric - no limit based on size b/c no stress from walking on land. all aquatic animal no matter what size will have same % skeleton. brain mass - isometric or allometrc? allometric - proportional to our surface area. larger animals have proportionatally smaller brains. sensory receptors proportional to surface area. metabolic rate - isometric or allometric? allometric - ability to metbolic a drug is based on surface area. cell body size - isometric or allometric? all cells are the same size. Jonathon Swift (Gulliver's Travels) - good physiologist? NO - gulliver was 12 times the size of a lilluputian. metabolism is proportional to his square. they gave him enough food for the cube of his size.