Answer: Endocrine system
Explanation: The hypothalamus is considered to be part of the human endocrine system, which is a system made up of important glands, such as the pituitary gland. This system is also known as and referred to as the <em>hormonal system</em>, because the hypothalamus makes hormones and sends these chemical "messengers" out into the blood to communicate with cells. The hypothalamus gland itself is a link between its endocrine system and the nervous system of the body in general. However, when we use the term nervous system, we are talking more about electrical signals rather than hormonal signals.
A. Working out in the morning is more effective...
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