Final answer:
The hypothalamus is the part of the brain responsible for regulating body temperature and hunger by controlling metabolic processes and the activities of the autonomic nervous system.
Step-by-step explanation:
The part of the brain responsible for the regulation of body temperature and hunger is the hypothalamus. The hypothalamus is situated just above the brain stem and is responsible for various metabolic processes and autonomic nervous system activities, such as controlling body temperature, heart rate, hunger, thirst, fatigue, and sleep cycles. Acting as the body's thermostat, the hypothalamus initiates processes to lower body temperature when it's too high, like increasing blood circulation to the skin and sweating, and to raise it when too low, like shivering and stimulating thyroid hormone production. It also controls the endocrine system by signaling the pituitary gland, influencing behaviors controlled by hormones, such as hunger.