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What is Thermoregulatory response activated by cold is- and explain in detail?
* 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).