Which of these anterior pituitary hormones is under tonic inhibitory control of hypothalamus instead of hypothalamic releasing factors?: (A) LH, (B) FSH, (C) TSH, (D) PRL
Answer is D. Prolactin secretion is under tonic inhibitory control by the hypothalamic secretion of dopamine ( Prolactin Inhibitory Factor) All other hormones of anterior pituitary - FSH, LH, TSH, ACTH, GH are stimulated by releasing factors secreted in hypothalamus.