Concept:The temperature control centre in mammals is a specific part of the brain that acts like a thermostat.
Explanation:The hypothalamus is a small but vital region located at the base of the brain.
It continuously senses the temperature of the blood flowing through it.
When the blood becomes too warm, the hypothalamus triggers heat-loss responses such as sweating and widening of skin blood vessels.
These actions help release excess heat and lower the body temperature.
When the blood becomes too cold, the hypothalamus triggers heat-gain responses such as shivering and narrowing of skin blood vessels.
These actions help generate and conserve heat, bringing the body temperature back to normal.
The skin mainly acts as an effector organ, but the central control remains in the hypothalamus.
Thus, the hypothalamus maintains a stable internal body temperature through homeostasis.
Answer:B. hypothalamus.