When core temperature might fall:

-The hypothalamus sends electrical impulses along motor neurones (nerve cells) to some of the muscles and to the skin.

-Nerve impulses causes muscles to contract and relax rapidly = shivering,

-Cells respire, glucose is oxidised to release energy to make ATP.

-Some of the energy is lost as heat, shivering therefore generates heat in the
muscle.

-Heat is then transferred into the blood as it passes through the muscles and then carried to the bloodstream (rest of the body)

-Nerve impulses also affect the smooth muscle in the walls of arterioles that supply blood to capillaries near the skin surface.

-The muscle contracts, narrowing the lumen of the arterioles and shutting off blood supply to the surface capillaries (Vasoconstriction)

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Homeostatis Coordinating cell activities