-This figure shows an example of regulation of hormone secretion by a negative feedback loop.The large box labeled 1 represents the initial stimulus.What hormones are represented by the small boxes labeled a,b,and c?
A)a = TSH,b = TRH,c = TH
B)a = TIH,b = TSH,c = TH
C)a = TRH,b = TSH,c = TIH
D)a = TRH,b = TSH,c = TH
E)a = TSH,b = TH,c = TRH

Question

-This figure shows an example of regulation of hormone secretion by a negative feedback loop.The large box labeled 1 represents the initial stimulus.What hormones are represented by the small boxes labeled a,b,and c?
A)a = TSH,b = TRH,c = TH 
B)a = TIH,b = TSH,c = TH 
C)a = TRH,b = TSH,c = TIH 
D)a = TRH,b = TSH,c = TH 
E)a = TSH,b = TH,c = TRH

Quizplus · Accepted Answer

The hormones represented by the small boxes in a typical negative feedback loop involving thyroid hormone regulation are Thyrotropin-Releasing Hormone (TRH) as 'a', Thyroid-Stimulating Hormone (TSH) as 'b', and Thyroid Hormone (TH) as 'c'. This sequence reflects the hormonal cascade from the hypothalamus (TRH) to the pituitary gland (TSH) and then to the thyroid gland to produce thyroid hormone (TH).

-This Figure Shows an Example of Regulation of Hormone Secretion