describe the mechanisms by which we regulate the magnitude of hormone activity?
149011
Negative feedback within homeostatic processes.\nGood examples to explain the process of negative feedback is the control of the menstrual cycle and the regulation of blood glucose levels .
937434
The endocrine system is the collection of organs and tissues that make hormones.  The hormones themselves control many things throughout your body, from development to emotional states to simple digestion.  As chemicals which circulate though your blood, they are considered to be 'fast' signals, though not as fast as nerve signals and the like.  Hormones are also never stored in your body... just made quickly as they're needed and used quickly.
893699
Hormones change in our bodies all the time.  You should consult with your doctor.
676259
Ha  ha.  That is funny.  Sorry honey - it is hormones and hormones alone that control those things.
1070827
It honestly is hormones,  some people produce more than others.  Also, certain conditions, like ADD produce more sweat thus potentially more order.
664071
Homeostasis basically relies on negative feedback mechanisms: if there is a deviation from the norm, eg an increase in blood glucose level, this will set in effect a chain of events that will bring the level back to the norm, at which point the lack of the original deviation switches off the events originally put into place, hence its called NEGATIVE feedback.
41590
Hormonal control is based on the ENDOCRINE SYSTEM. Nervous system control is based on the NERVOUS SYSTEM.\n\nBoth rely on the parts of the brain for control.\nEndocrine or hormonal control is handled through a number of glands like the pituitary gland, the thyroid glansd, adrenal gland and numerous others. These all have a feedback loop that continually adjust levels of certain hormones. These hormones control everything from water balance, blood pressure and sleep cycle to sex drive and reproduction.\n\nThe nervous system has sensory neurons and motor neurons. Some are auromatically controlled while others are voluntary. Some like breathing are both.  Nervous control is impacted by hormonal control and the two systems interact often to maintain homeostasis of the human body.
288642
Hormones are chemical messengers in the body that can do many things. It depends on the hormone. \n\nHormones trigger growth spurts and the onset of puberty. They can regulate blood sugar (insulin is a hormone). Hormones can trigger the 'fight or flight' response in you when you face danger (that's adrenalin). \n\nLook at these websites:\nhttp://en.wikipedia.org/wiki/Endocrine_system\nhttp://en.wikipedia.org/wiki/Hormones
415184
Some hormones, like parathyroid hormone and calcitonin, directly act on cells that lay down and take up bone--mainly acting to regulate the calcium, but also the actual amount of bone.\n\nOthers, like testosterone, estrogen and progesterone, act less directly; all three of these, like calcitonin, tend to increase the amount of bone mass laid down.\n\nThere are some other substances involved as well: calcium and phosphate (bone is mostly a calcium hydroxy apatite crystal, which is mainly calcium and phosphate) and Vitamin D, which is involved in the body's handling of calcium.
38329
The first answer was good, although mostly copy$paste \nhttp://www.nda.ox.ac.uk/wfsa/html/u05/u05_010.htm\n\nThe circulatory system is regulated both by the autonomic nervous system (with two antagonistic systems that may increase peripheral circulation or visceral circulation, slow/accelerate heart rate, etc) and by the endocrine system. Hormones have slower, but more long-term effects than nervous "orders" but both are necessary.
20719
You are probably referring to metabolism.  Metabolism is a collection of chemical reactions that takes place in the body's cells to convert the fuel in the food we eat into the energy needed to power everything we do, from moving to thinking to growing. Specific proteins in the body control the chemical reactions of metabolism, and each chemical reaction is coordinated with other body functions. In fact, thousands of metabolic reactions happen at the same time - all regulated by the body - to keep our cells healthy and working.
99271
genetics and hormones
105087
Insulin is a hormone that regulates the glucose level in blood. It is a hormone secreted by the islets of Langerhans in the pancreas that regulates the level of glucose in the blood. Deficiency in production results in diabetes mellitus.
197575
Endocrine refers to all hormones, not just those of the pancreas.  They are made in one cell and released into the blood stream where they work on distant cells.\n\nNeurological transmissions are predominately electrical.  The neuron gets depolarized and sends an electric signal down its axon (long process of the cell) to where it will be going to  (a muscle for example).  When the electric signal reaches its destination (the end of the axon) it causes a release of a neurotransmitter from the axon (each axon only releases one type of neurotransmitter).  These transmitters diffuse to where they are going (a muscle for example) and cause a change in that cell.\n\nSome similarities are that both hormones and neurotransmitters have specific receptors for them and they both cause changes in the cells that they interact with.  Also, there are some neurotransmitters that are hormones, they are released from the end of the axon into the bloodstream and then go to distant cells to do their work.
82949
To trigger a biological response.
152742
Hormones are important in appetite regulation. Leptin, made by fat tissue, suppresses appetite; ghrelin, made by the stomach, increases appetite; both act on the arcuate nucleus. Neurotransmitters within the brain may also moderate appetite. Drugs related to these hormones and neurotransmitters are capable of controlling appetite and are a hope for the future in obesity treatment
748229
The most important factor that dictates a hormones target organ is its ability to bind to the specific organ tissue and produce a response.  In order for this to occur the organ tissue must have the correct receptor that will bind to the hormone and produce a physiological response.  It is like the hormone is a key that will only work on certain organs.  In order for the organ to have a response to the hormone it must have the correct receptor, which is like the lock for the key.  In addition to having the right receptor (lock) for the hormone to fit and bind to, the binding of the hormone and receptor must be able to have an effect on the target tissue.  The ability of a certain tissue to have the correct receptor for a given hormone is properties of individual tissues and is a factor that helps differentiate a liver tissue from heart or brain tissues.