PNB 2250 Exam 4 (UConn) Questions
and Answers
Allen's Rule - Ans:-Animal shapes minimizes heat loss in cold climates and heat gain in warm
climates
Related to surface/volume
Arm length in tropical climates longer than
arm length in
cold climates
Might be related to cartilage growth
Effects...
•So a doubling in length will only produce 6x as many new cells, instead of 8x as many new cells in
isometric scaling
As an animal double in length, the surface
area of the lungs increases 4-fold, but there
are 6-fold more cells
Animals scale allometrically not isometrically - Ans:✔✔-◦ Likely due to the constraints on nutrient
delivery
◦ So a baby's head is a larger percentage of the whole body size than a young adult.
◦ The body mass grew but the limbs did not grow proportionately
Kleiber's Law - Ans:✔✔-Animals metabolic rate scales allometrically with volume with a coefficient <1.0
Mr = c(M^0.75)
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