“The hypothalamus regulates body temperature, blood pressure, heartbeat, and the metabolism of fats and carbohydrates. Also the sleep-wake cycle. We think it holds the centers of pleasure and pain. It’s a very complicated organ, Lieutenant.” She looked fixedly at him, anticipating a question. D’Agosta mumbled dutifully, “How does it do all that?” “Hormones. It secretes hundreds of regulatory hormones into the brain and bloodstream.”
