Final answer:
The internal temperature of the body is regulated by the hypothalamus, which acts as the body's thermostat, maintaining homeostasis through various temperature-adjusting processes. The correct option is A) Hypothalamus
Step-by-step explanation:
The body's "thermostat" that regulates the temperature of the internal environment is located in the hypothalamus. The hypothalamus, situated below the thalamus in the brain, plays a crucial role in maintaining homeostasis, which includes thermoregulation - the process by which the body maintains its core temperature.
When the internal environment's temperature deviates from the set point, the hypothalamus initiates responses like sweating, shivering, vasodilation, and vasoconstriction to correct it. During certain conditions, such as an infection, the hypothalamus may adjust its set point to create a fever, which is beneficial in fighting off pathogens. The correct option is A) Hypothalamus