BIO120H1 Chapter Notes - Chapter 3: Vascular Bundle, Red Algae, Fuzhou Dialect
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BIO120H1 Full Course Notes
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When air temp. approach the max. tolerable body temp. , animals dissipate heat only by evaporating water from their skin and respiratory surfaces. Animals become less active, seek cool microclimates, and sometimes undertake in hot deserts, water is scarce, evaporative cooling is costly seasonal migrations to cooler regions. Kangaroo rats: venture out only at night, during the day stay in their cool humid burrows. Ground squirrels: remain active during the day, and their body temperature rises; before their temp. goes too high, they go to their cool burrows to lose heat w/o losing water. They shuttle back and forth b/w their burrows and the surface. Camels: allow body temp. to rise during the day. Their large bodies give them an advantage. W/ increasing size, the surface area of an animal (across it which it absorbs heat and intercepts solar radiation) increases less rapidly than the animal"s volume (which is the bulk that heats up)
