<prompt> Thermoregulatory response activated by cold is-Cutaneous vasodilatationAnorexiaIncreased voluntary activityIncreased respiration  <response>: In cold environment, muscular contractions are increased and there is increased heat production Increased muscular contraction can be due to: 1 Increased tone of muscles. 2 Voluntary activities like foot stamping, hand rubbing, spoing activities etc. Hypothalamic stimulation in cold environment brings about the following effects which help against cold- 1 Cutaneous vasoconstriction. 2 Shivering involuntary muscular contractions. 3 Horripilation Piloerection standing up of body hair. 4 Adipose tissue lipolysis generates heat. 