Explain how the hypothalamus-pituitary complex operates as a feedback control?

Explain how the hypothalamus-pituitary complex operates as a feedback control,


including a few examples of RF's (releasing factors), pituitary hormones and target tissues; e.g.,


TSH on thyroidExplain how the hypothalamus-pituitary complex operates as a feedback control?
Well, it's basically like a response. For example, if you get an allergic reaction, your body will release histamines in order to combat these foreign invaders.Explain how the hypothalamus-pituitary complex operates as a feedback control?
This can generally be a hard concept with the fact the pituitary and the hypothalamus have many different jobs. But with a general reflex arc, or when the body is excited or scared for instance, there are a series of reactions that occur. For instance, if you were burned, first a message would be sent to the brain about the pain, and then the carotene and other materials would be sent through with your blood to make a temporary scar for healing purposes to happen.





I will try to find some links to explain it better to you.





http://www.vivo.colostate.edu/hbooks/pat鈥?/a>


http://science.jrank.org/pages/3381/Horm鈥?/a>


http://en.wikipedia.org/wiki/Hypothalami鈥?/a>
releasing factors are produced by the hypothalamus and these control or are referred to as trophic in lauralee sherwood because it causes the other organs to produce hormones in response......they nurture the pituitary gland........eg the hypothalamus produces CRH corticotrophin releasing hormones which stimulate the release of ACTH from the anterior pituitary gland.....ACTH will arrive at the target cells in the kidneys and attach to the receptors there and stimulate the kidneys to produce cortisol......an inportant component of combating stress......it helps to alleviate stress by causing an increase in glucose and amino acids to prepare for a stressful situation that requires fight or flight resp......together with adrenaline in synergism.......





once cortisol is produced it will be circulated in the blood and will be transported to the hypothalamus and pituitary glands where their concentrations ';unbound'; to albumin provides the feedback control to determine the appropriate response.........this is a negative feedback control mechanism......as CRH levels decrease.....ACTH will subsequently decrease and therefore after cortisol reached its peak, the feedback control will turn off the production until needed again.........this is also known as the hypo-pituitary axis....and this axis can be altered due to many factors eg.....through the prolonged used of cortisone products like prednisolone......a cortisol derivative that suppresses the axis and when the medication is withdrawn....the axis will be affected....