Endocrine glands produce and release hormones using one of three mechanisms:
humorous stimuli
hormone-related stimuli
neural stimulation
In reaction to changes in extracellular fluids, such as blood or ion concentration in the blood, hormonal stimulus regulates the hormone release.
For example, an increase in blood glucose causes the release of insulin.
The term "hormonal stimuli" describes when a hormone is released in reaction to another hormone.
An illustration would be the hypothalamus, which releases hormones that stimulate the anterior pituitary, which then releases hormones that control the release of hormones by other endocrine glands.
The term "neural stimulation" describes how the neurological system causes the release of hormones.
For instance, during times of stress, the adrenal medulla releases chemicals like adrenaline and norepinephrine when the sympathetic nervous system is activated, giving the body the burst of energy, it needs to generate a reaction.
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