Describe the physiological responses involved in thermoregulation during exposure to cold and heat stress.

Thermoregulation is the physiological process that maintains the body's internal temperature within an optimal range despite external temperature variations. It is controlled by the hypothalamus, which acts as the body's thermostat, receiving input from thermoreceptors and initiating appropriate responses to maintain homeostasis. The physiological responses to cold and heat stress involve several mechanisms that regulate heat production, heat loss, and blood flow distribution.  

### Physiological Responses to Cold Stress  

When exposed to cold environments, the body activates mechanisms to conserve heat and increase heat production. These responses include:  

1. Vasoconstriction – The sympathetic nervous system triggers vasoconstriction of blood vessels in the skin and extremities, reducing blood flow to peripheral tissues. This helps to minimize heat loss by redirecting warm blood to ________ _________ ____ ____ ________ _____ ________ _____ ______ _______ _____ _______.
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