Lecture 11 Biology 2

Lecture 11 Biology 2 - Introduction to Animal Form and...

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Introduction to Animal Form and Function Animal Form and Function— Introduction I. Exchange with the environment I. Surface area to volume II. Homeostasis III. Thermoregulation Physical Laws dictate Animal Form Physical laws constrain the size and shapes of animal form
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Surface Area to Volume Ratio 1) Dictates many important properties of animal form and function 1) 2) Body surface area increases with square of body length, but mass increases with the cube of body length. 1) SA = 10 Volume=2 SA = 40 (4 x) Volume = 16 (8x) 0 200000 400000 600000 800000 1000000 1200000 05 0 1 0 0 Length (x) Value Surface area (cm2) V olume (cm3) From a grape to a basketball to a moon… GIANT Insects • B-rated horror movies – Giant ants, spiders, wasps, moths, etc. • Surface-area to volume ratio –SA cube = –Vo l cube = • 10-fold increase in length – 1000 fold increase in Vol
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Exchange with the environment Exchange with the Environment Larger and more complex animals -- folding and branching -- circulatory
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Lecture 11 Biology 2 - Introduction to Animal Form and...

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