Whats the average life span of a Ipod Shuffle 2nd generation? what I mean is how long should the battery last and charge for before it compleatly dies. HP Pavilion a510n 2.10ghz athlon 3000+, Windows XP, Ipod Shuffle 2nd generation Blue.
Graves disease is the most common cause of hyperthyroidism. Graves disease is an autoimmune disorder in which antibodies are produced that bind to the TSH receptor.s diagrammed in the figure, when there is less T3 and T4, there is reduced negative feedback inhibition of secretion of the tropic hormones, TRH (thyrotropin releasing hormone; released by the hypothalamus) and TSH (thyroid stimulating hormone or thyrotropin; released by the anterior pituitary).
Answers. 1  There are actually countless feedback loops in the human body, so it would be quite difficult to pinpoint them all. Generally, though, positive feedback loops cause some kind of amplification, and negative feedback loops work to maintain conditions at a certain level. Furthermore, negative feedback loops generally work to shut themselves off, whereas positive feedback loops must be shut off by a different set of mechanisms. An example of a positive feedback system would be blood clotting. When you get injured, the damaged tissue releases chemical signals that activate platelets. These platelets release chemicals that activate other platelets, and so on and so forth, until lots and lots of platelets are activated and clots form. Once the clotting has been taken care of, separate signals are used to shut off the cascade. Negative feedback occurs in a lot of processes that maintain homeostasis.