These hormones can also act on other glands to stimulate the release of different types of hormones and bring about effects. It secretes several hormones into the blood in response to the body's condition, such as blood water levels. The pituitary gland in the brain is known as a 'master gland'. There are important differences between nervous and hormonal control. Hormones can control the body, and the effects are much slower than the nervous system, but they last for longer. Once a hormone has been used, it is destroyed by the liver. One of its target organs is the heart, where it increases the heart rate. An example of this is the release of the hormone adrenaline, which is released by the adrenal gland. Human endocrine system Hormones and nervesĪ hormone is a chemical substance, produced by a gland and carried in the bloodstream, which alters the activity of specific target organs.
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