13 terms

Endotherms and Ectotherms

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Endotherm
Control their internal body temperature with very strict limits - independent of external environment
Ectotherm
Not able to regulate their own body temperature - dependent on external environment
Endotherms
Lots of different mechanisms to regulate body temperature
Ectotherms
Can generate a little bit of extra heat for respiration by muscle contractions
Endotherms positive
Fairly constant temperature
Remain active despite cold
Can live in cold areas
Endotherms negative
Significant part of intake energy used to regulate body temperature
Need more food
Less energy for growth
May overheat in hot weather
Ectotherms positive
Less food energy used in respiration
More used for growth
Can survive longer without food
Ectotherms negative
Must gain heat in cold
Less active in cold
Example - locust (bug)
Moves up and down plant stem to be right distance from hot soil
Example - Snake
Lies in sun
Example - horned lizard
Expands/contracts rib cage accordingly to adjust surface area to volume ratio
Thermoregulation
Regulation of temperature in the body
Example - hare
Has large ears to increase surface area to cool blood
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