<prompt> False about thyroid stimulating hormone TSH is:secretion is pulsatile In naturenormal plasma level is 0.2-0.5 micro IUmlsecretion is entirely under control of hypothalamusincreases synthesis and release of thyroid hormones  <response>: 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 