Self-test questions: Chapter 21

. Which of the following statements regarding the hypothalamic hormones are correct?

Hypothalamic releasing hormones are synthesized and secreted by neurons

Blood flows from the anterior pituitary to the hypothalamus in portal vessels.

The hypothalamic releasing hormones reach the general circulation in significant amounts

Growth hormone secretion is regulated by GHRH and somatostatin

. Which of the following statements relating to the pituitary hormones are correct?

Oxytocin stimulates the secretion and synthesis of milk by the mammary glands secreted by the hypothalamus

ACTH stimulates the output of hormones from the adrenal medulla

Lack of vasopressin (ADH) will result in excessive production of urine.

The secretion of oxytocin and vasopressin (ADH) are regulated by releasing hormones secreted by the hypothalamus.

. Which of the following statements relating to anterior pituitary hormones are correct?

LH and FSH secretion are controlled by different hypothalamic releasing hormones.

LH and FSH are collectively known as the gonadotrophins

TSH and GH are both glycoproteins

GH and prolactin have close structural similarity

MSH is derived from the same precursor as ACTH

. Which of the following statements concerning growth hormone (GH) are correct?

GH shows increased secretion during REM sleep

The indirect actions of GH are mediated by insulin-like growth factors (IGFs)

IGFs are synthesized mainly in the anterior pituitary gland

GH is required for growth in stature from birth to puberty

An increase in somatostatin secretion will result in a fall in GH secretion

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