Final answer:
The substance capable of raising body temperature is thyroxine (T4), a hormone secreted by the thyroid gland that increases the basal metabolic rate and causes the body's temperature to rise.
Step-by-step explanation:
A substance capable of raising the body temperature is known as thyroxine or T4. This hormone is secreted by the thyroid gland and plays a critical role in regulating the body's basal metabolic rate (BMR), which in turn influences body temperature. When the thyroid gland releases more T4, the BMR increases, and this leads to a rise in body temperature. The hormone's ability to increase energy production and glucose oxidation in the body cells is termed its calorigenic effect. It is important to note that the other substances listed, such as insulin, acetylcholine, and glucagon, do not directly raise body temperature, although they have other vital roles in the body's metabolic processes.