False about thyroid stimulating hormone (TSH) is:: (A) secretion is pulsatile In nature, (B) normal plasma level is 0.2-0.5 micro IU/ml, (C) secretion is entirely under control of hypothalamus, (D) increases synthesis and release of thyroid hormones
Answer is C. TSH secretion depends upon the levels of T3,T4 as it is affected by FEEDBACK REGULATION Ref: guyton and hall textbook of medical physiology 12 edition page number: 555,556,557