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(D) When a person is exposed to a cold environment,the body initiates several thermoregulatory mechanisms to maintain homeostasis. $1$. Shivering is a

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Increased heart rate and stroke volume

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(D) When a person is exposed to a cold environment,the body initiates several thermoregulatory mechanisms to maintain homeostasis. $1$. Shivering is a rapid contraction and relaxation of skeletal muscles to generate heat. $2$. Vasoconstriction reduces blood flow to the skin to minimize heat loss. $3$. The hypothalamus triggers the release of thyroid hormones (thyroxine) and adrenal medulla hormones (epinephrine/norepinephrine) to increase the metabolic rate and heat production. $4$. Heart rate and stroke volume generally increase to support metabolic demands,but they are not primary thermoregulatory responses that a person 'cannot' exhibit; rather,they are physiological adjustments. However,in the context of standard physiological questions regarding thermoregulation,all these are typical responses. If the question implies a physiological impossibility,it is often noted that the body cannot 'stop' these responses voluntarily. Given the options,all are standard responses to cold stress.

$A$ person placed in a cold environment cannot exhibit which of the following?

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