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What are hormones and what do they do?What are hormones and what do they do?
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- make people grow or stop growing,
- make people feel happy or sad,
- speed up or slow down the metabolism,
- starting puberty,
- starting menopause,
- regulating your fighting, mating, and fleeing instincts.
Hormones are like messengers in your body that give orders to your cells to do particular things. They are chemicals that are manufactured by glands and released into the bloodstream, sort of holding a sign up with a type of cell's name on it (like a limo driver at the airport waiting to pick up a client.) Most cells ignore the hormone, but when it comes across the right one its chemical "message" is read and the cell starts to do what it has been told. This message could be a lot of different things, but generally it is meant to keep the body functioning and in balance. Too much of a certain hormone can have results such as your gym partner in 8th grade growing a mustache before everybody else or your girlfriend in the 9th grade freaking out on you during "that time of the month."
Here are some things that hormones do for the body. Remember, though, they are only the "messengers" that start the cells into action. They go out into the body when told to by a higher power (the gland) and it's the cell that actually does the work.
Here is a snazzy picture of the different glands and organs that secrete hormones: click.
Posted by ophelious on May 13, 2010 at 7:23 PM (Answer #2)
Hormone are chemical substances produced within an animal or a plant which act as "chemical messengers" as means of communication among various parts of an organism. They help these parts function in a coordinated way. Hormones control such body activities as growth, development, and reproduction.
First definite evidence of existence of hormones was found in 1902, when British researchers discovered that a chemical substance controlled certain activities involved in digestion. Since then more than 30 hormones produced by the human body have been identified.
Most hormones in the human body are produced by organs called ductless glands (endocrines). These include the two adrenal glands, the pituitary gland, the four parathyroid glands, the sex glands, and the thyroid gland. A few hormones are also produced by endocrine tissue present in organs which not primarily endocrine glands. These organs include the stomach and pancreas.
Various endocrine glands secrete hormones into the blood, which carries them throughout the body. When a hormone arrives at its target organ or tissue it causes certain actions to take place.
Hormones may be grouped according to the functions they control. These functions include the way the body uses food; growth; sex and reproduction; the regulation of the composition of the blood; the reaction of the body to emergencies; and the control of hormones themselves.
Most human hormones can be divided into two groups according to their chemical structure - steroids and amino acid based hormones. Steroids, consists of the sex hormones and the hormones of the adrenal cortex. Most other human hormones contain some form of amino acids, the building blocks of proteins.
Chemical structure of a hormone enables it to combine with a receptor in the cells of its target. The union of the hormone with the receptor triggers a change in the chemical processes of the cell. This change, in turn, modifies many of the hundreds of chemical activities of the cell, causing the target to behave in a certain way.
Posted by krishna-agrawala on May 13, 2010 at 9:41 PM (Answer #3)
'Hormone' comes from the Greek word 'hormon' which means "that which sets in motion."
Hormones are produced by the endocrine glands in the body. These glands are also called 'ductless glands' meaning that the glands directly empty the hormones into the bloodstream.
There are four types of hormones, namely, steroid, lipid, protein and amino acid hormones.
Hormones control the various metabolic activities of the body. They help to provide the proper amount of energy and nutrition your body needs to function. The glands that make up the endocrine system include the thyroid, parathyroid, pancreas, ovaries, testes, adrenal, pituitary and hypothalamus.
Posted by lit24 on May 14, 2010 at 9:15 PM (Answer #4)
Hormone (greek: ορμόνη - horman, hormanus - put in motion, to wake) is a biochemical substance that transmits information from an organ or tissue to another, is secreted by endocrine glands or other tissues, which stimulates and coordinates the activities of certain organs or whole body.
Unlike the nervous system, where information from the center (brain or spinal cord), namely nerve impulses, propagated by axonal or dendritic extensions, have a speed that takes fractions of seconds, the transmitted information on hormone path are slower, something like in case of adrenaline, when it takes seconds, while to the other hormones, it lasts for days, until the information is reaching the target organ or tissue.
The exception to this rule are tissue hormones (produced by tissues), hormones such as: histamine, serotonin, and prostaglandin, which are produced directly by the parenchyma of the target organ.
Hormones were discovered in the early twentieth century, the term hormone being first used in 1905, by English psychologist Ernest Starling (1866-1927).
Hormones from animal body are produced also by the endocrine glands: pituitary, epiphysis, thyroid, parathyroid, pancreas, adrenal cortex and islets of Langerhans, gonads or sex glands. The name of endocrine glands is because the hormones produced by glands flow directly into the blood, being transported via blood to target organ.
Hormones produced by plants are called phytohormones (e.g. the have a core consisting of a phenolic and steroid grouping) and like hormones produced by the animal body, they are acting at the distance, being sufficient a very small quantity.
Science that deals with endocrine glands and study of hormones is called endocrinology.
Posted by giorgiana1976 on May 18, 2010 at 10:13 PM (Answer #5)
This is about female hormones.
Your body produces two prominent hormones: estrogen and progesterone. Both hormones are manufactured in your ovaries and play important roles in a your reproductive system.
Estrogen is the hormone responsible for the healthy development of your female sexual characteristics such as your breasts, vagina, your menstrual cycle, body shape, and hair growth under the arms and around the pubic region. It also regulates the release of the ovarian eggs and works with progesterone to stop the ovulation cycle during when you get pregnant. Particularly for women, this hormone is necessary in the proper development of the bone and the metabolic processes.
Progesterone, on the other hand is the other hormone that regulates your menstruation. It supports pregnancy and tempers the highly stimulatory effects of estrogen. Progesterone also helps in the development of the embryo produced by your ovaries by providing a source of corticosteroids.
Progesterone improves your bone density and has beneficial influence on your cardiovascular system and cholesterol. Progesterone also increases the metabolic rate of your digestive system. It has anti-inflammatory actions and regulates the your body’s immune response.
These two hormones, along with testosterone and DHEA work together to provide great health for you. Along with the unisex follicle stimulating hormone (FSH) and luteinizing hormone (LH), all of these hormones play specific functions in a your reproductive system.
Posted by raid1802 on June 2, 2010 at 10:54 PM (Answer #6)
High School Teacher
Consider how hormone therapy is used with some people, especially postmenopausal women, those who have had hysterectomies and men or women undergoing sex reassignment surgery, where hormones are administered regularly to alleviate undesirable symptoms or to achieve desired physical results. The birth control pill, as another example, is a low dose hormone that makes the body believe it is already pregnant.
Posted by brettd on January 31, 2011 at 5:54 PM (Answer #7)
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