How do endothermic animals like seals and foxes âknowâ thattheir body temperature needs to be adjusted?

1.
When shivering starts they know itâs time to warm up

2.
Nerve cells in their brains measure the temperature of blood andsend signals to other cells and tissues if the temperature changesvery much one way or the other

3.
Reduced mobility, sluggishness, are all signs of too-low bodytemperature

4.
Temperature-sensing cells in their extremities (eg, legs andfeet) measure the environmental temperature and signal the brainthatâs itâs time to change body temperature

Question

How do endothermic animals like seals and foxes âknowâ thattheir body temperature needs to be adjusted?

	1.	When shivering starts they know itâs time to warm up
	2.	Nerve cells in their brains measure the temperature of blood andsend signals to other cells and tissues if the temperature changesvery much one way or the other
	3.	Reduced mobility, sluggishness, are all signs of too-low bodytemperature
	4.	Temperature-sensing cells in their extremities (eg, legs andfeet) measure the environmental temperature and signal the brainthatâs itâs time to change body temperature

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