<written on 2019.1.12>
When you are cold, you body just starts to shiver. What is the reason that our bodies do so?
When your body's temperature starts to drop, the brain orders muscles all around your body to repeat contraction and relaxation. Contraction is when a muscle tightens, and relaxation is the opposite. When muscles contract and relax, they produce heat. The brain orders the body to shiver to get this heat.
In the brain, the Hypothalamus, which is a part of the Hepatic Brain, is in charge of thermoregulation, or regulating the body's temperature. The Hepatic Brain is located at the innermost part of the brain, and the Hypothalamus is the front part of it. When the nerve cells in the skin feel coldness, the Hypothalamus sends a signal to the anterior pituitary gland, which is located under the Hypothalamus. The anterior pituitary gland then secretes Adrenal Cortical Stimulating Hormones(a.k.a. steroid) and Thyroid Stimulating Hormones(which are secreted at the Thyroid and help growth, a.k.a. Thyroid hormones) and make the Adrenal Cortex to secrete Corticoid, and the Thyroid to secrete Thyroxine. Corticoid and Thyroxine can affect the liver and muscles to produce heat by promoting metabolism. in this case, these hormones contract the skeletal muscle to derivate the 'shivering' of the body to increase heat production.
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