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f) Describe the physiological and behavioural responses that maintain a constant core body
temperature in ectotherms and endotherms.

Ectotherm: an organism that relies on external sources of heat to regulate its body
temperature.
use less food in respiration.

need less food and may be able to survive for long periods…

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If core temperature drops below the optimum, the hypothalamus sends signals to reverse
the change ­ increased rate of metabolism, release heat through extra muscular contraction
and decrease loss of heat to the environment.

If the core temperature rises above the optimum, the hypothalamus sends signals to bring
about the…

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