Actions of Hormones (Hypothalamus, Anterior Pituitary, Posterior Pituitary, Thyroid) Flashcards
The hypothalamus is the gland of origin for what six hormones?
TRH, CRH, GnRH, SRIF, PIF, GHRH
What is the chemical classification of TRH and what is its major action?
Peptide
Stimulates secretion of TSH and prolactin
What is the chemical classification of CRH and what is its major action?
Peptide
Stimulates secretion of ACTH
What is the chemical classification of GnRH and what is its major action?
Peptide
Stimulates secretion of LH and FSH
What is the chemical classification of SRIF and what is its major action?
Peptide
Inhibits secretion of growth hormone
What is the chemical classification of PIF and what is its major action?
Amine
Inhibits secretion of prolactin
What is the chemical classification of GHRH and what is its major action?
Peptide
Stimulates secretion of growth hormone
What is the major function of the hypothalamus?
Secretion by the anterior pituitary (increase or decrease)
The anterior pituitary is the gland of origin for what seven hormones?
TSH, FSH, LH, growth hormone, Prolactin, ACTH, MSH
The hormones of the anterior pituitary are all what type?
Peptide
What is the chemical classification of TSH and what is its major action?
Peptide
Stimulates secretion and synthesis of thyroid hormones (increase size)
What is the chemical classification of FSH and what is its major action?
Peptide
Stimulates sperm maturation in Sertoli cells of testes
What is the chemical classification of LH and what is its major action?
Peptide
Stimules testosterone hormones in Leydig cells of testes
Stimultes ovulation, formation or corpus luteum, estrogen and progesterone synthesis in ovaries.
What is the chemical classification of growth hormone and what is its major action?
Peptide
Growth, organic metabolism; secretion of somatomedin by liver and cartilage
What is the chemical classification of prolactin and what is its major action?
Peptide
Stimulates milk production and secretion in breasts
What is the chemical classification of ACTH and what is its major action?
Peptide
Stimulates synthesis and secretion of adrenal cortical hormones (CORTISOL, androgens, and aldosterone)
What is the chemical classification of MSH and what is its major action?
Peptide
Stimulates melanin synthesis
The posterior pituitary is the gland of origin for which two hormones?
Oxytocin
Vasopressin (ADH)
What type of hormones are oxytocin and vasopressin?
Peptide
What is the chemical classification of oxytocin and what is its major action?
Peptide
Stimulates milk ejection from breasts and uterine contractions
What is the chemical classification of vasopressin (ADH) and what is its major action?
Peptide
Stimulates water reabsorption in principal cells of collecting ducts and constriction of arterioles
The thyroid is the gland of origin of what three hormones?
T3, T4
Calcitonin
What is the chemical classification of T3, T4 and what are its major actions?
Amine
Stimulates skeletal growth; oxygen consumption; heat production; protein, fat, and carbohydrate utilization; perinatal maturation of the central nervous system
What is the chemical classification of calcitonin and what is its major action?
Peptide
Decreases serum [Ca2+]
