Shivering - nerve impulses are sent by the hypothalamus to the skeletal muscles to bring about rapid contractions that generate heat. Shivering therefore helps raise the body temperature. Increase in metabolic rate - the liver produces extra heat in order to raise the temperature of the body.

iracund

iracundity

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irade

irascent

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irascibleness

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iridalgia

iridate

iridauxesis

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iridectomy

iridectropium

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iridencleisis

iridentropium

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iridine

iridiocyte

iridiophore

iridioplatinum

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iridium

iridization

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iridoavulsion

iridocapsulitis

iridocele

iridoceratitic

iridochoroiditis

iridocoloboma

iridoconstrictor

iridocyclitis

iridocyte

iridodesis

iridodiagnosis

iridodialysis

iridodonesis

iridokinesia

iridomalacia

iridomotor

iridoncus

iridoparalysis

iridophore

iridoplegia

iridoptosis

iridopupillary

iridorhexis

iridosclerotomy

iridosmine

iridosmium

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irisation

iriscope

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irisin

irislike

irisroot

iritic

iritis

irk

irksome

irksomely

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irok

iroko

iron

ironback

ironbark

ironbound

ironbush

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ironflower

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ironhead

ironheaded

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ironwort

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irreprovably

irreptitious

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irresistibleness

irresistibly

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irresolute

irresolutely

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irresolution

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irresolvableness

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irritatory

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irritomotility

irrorate

irrotational

irrotationally

irrubrical

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irruptible

irruption

irruptive

irruptively