Thermoregulation:

• Methods of thermoregulation (maintenance of __ body temperature)

– Ectotherms = organisms that obtain their heat from __ sources (most organisms)

– Endotherms = organisms that __ their own heat (metabolic heat...US!)

– Poikilotherms = organisms that have a body temperature that fluctuates with __ (external temperatures)

– Homeotherms = organisms that have a __ body temperature 

• Requires high caloric intake

• Can be nocturnal, inhabit cold environments

Temperature Relations:

• Radiation – energy absorbed and emitted in the form of __ __ (from Sun &

other objects)

• Conduction - transfer of heat between

objects in __ contact with one another

Temperature Relations:

• Convection - direct transfer of heat by the movement of a __ (air and H₂0)

• Evaporation - heat loss as __ is evaporated from an organism’s surface

Homeostasis:

• Endotherms use __ __ to regulate body temperature

• Homeostasis = an organism’s ability to maintain constant __ conditions in varying environments

• Is costly:

– As difference between internal & external conditions ↑

– Cost of maintaining homeostasis __

– Metabolic rate ↑

Range of Tolerance:

• Most species perform best in a fairly __ range of conditions

– Temperature, moisture, light, nutrient

availability

• Range of tolerance: entire range of conditions over which a species is able to survive

– Levels outside of this range are __