Endocrine Systems : Hormones And The Endocrine System

1390 WordsMay 28, 20166 Pages
Endocrine System:
 Hormones are chemical substances that act as messengers in the body. They are produced in endocrine glands scattered throughout the body. Together all these glands form the endocrine system.

The endocrine system is coordinated by the pituitary gland, which responds to information from the hypothalamus. The hypothalamus is a portion of the brain and is made of nervous tissue. It constantly checks the internal environment — that is, the conditions within the tissues, organs and systems of your body. If these conditions change, the hypothalamus responds.

The most important function of the hypothalamus is to link the nervous system and the endocrine system. It secretes hormones that act on the pituitary gland. The…show more content…
These are the target cells.
 Different hormones have different chemical structures. This means that their shape varies. It is the shape of the hormone that makes it specific. Within cells are receptors. A hormone is only active in cells that have receptors that fit the shape of the hormone. 

Controlling the internal environment:
 Your body works most efficiently when the internal environment is reasonably constant. This means that factors such as temperature, water content, available energy, availably oxygen and concentration of wastes in the blood are all controlled. The process of maintaining a constant internal environment is known as homeostasis.

Homeostasis involves receptors that are sensitive to a particular stimulus, and effectors that have an effect on the same stimulus.

Controlling Body Temperature:
 Digestion, growth and repair, respiration and manufacture of hormones are some of the chemical reactions taking place inside your body. All these reactions together are known as your metabolism. 

The heat they produce as a by-product maintains your body temperature regardless of the temperature regardless of the temperature of your surroundings. Because humans can maintain a constant body temperature, they are said to be endothermic. However, if the temperature inside your body was to increase by more than a few degrees above 37°C, your metabolism would stop, and you would die. If your body temperature
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