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43 Cards in this Set
- Front
- Back
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What does GnRH stand for?
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Gonadotrophin releasing hormone
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What does GnRH do?
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releases FSH and LH from anterior pituitary
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What does TRH stand for?
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thyrotrophin releasing hormone
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What does TRH do?
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releases TSH and prolactin from anterior pituitary
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What does CRH stand for?
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Corticotrophin releasing hormone
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What does CRH do?
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releases ACTH from anterior pituitary
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What does GH-RH stand for?
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growth hormone releasing hormone
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What does GHRH do?
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releases growth hormone from anterior pituitary
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Somatostatin
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inhibits growth hormone release from anterior pituitary
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What does oxytocin do?
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causes contraction of smooth muscle
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Where is oxytocin produced?
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hypothalmus and CL
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Where is oxytocin released from?
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posterior pituitary
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What does FSH stand for?
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follicle stimulating hormone
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What does FSH do?
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stimulates follicle growth and spermatogenesis
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What does LH stand for?
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leutinizing hormone
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What does LH do?
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causes ovulation and maturation of oocyte, maintains CL
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What does prolactin do?
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stimulates maternal behavior
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What does corticotrophin do?
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stimulates cortisol release from adrenal gland
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What does TSH stand for?
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thyroid stimulating hormone
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What does TSH do?
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stimulates thyroxin release from the thyroid gland
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What does eCG stand for?
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equine Chorionic Gonadotrophin
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What does eCG function like?
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Contains mainly FSH-like activity but also some LH-like activity
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Where is relaxin secreted from?
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CL
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What are 2 functions of relaxin?
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cervical dilation
inhibits uterine contractions |
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Where does inhibin come from?
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secreted by sertoli cells in the male and granulosa cells in the female
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What does inhibin do?
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inhibits FSH secretion w/out altering LH secretion
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What steroid hormones are produced in the mitochondria?
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cholesterol and pregnenolone
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What steroid hormones are produced in the smooth ER?
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estradiol, testosterone, and progesterone
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What 2 things does PGF do?
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regresses CL
controls uterine contraction |
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Where does melatonin come from?
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pineal gland
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What does melatonin do?
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Integrates effects of light on reproductive processes
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What hormones are polypeptides?
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releasing hormones (-RH), somatostatin, oxytocin
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What hormone is an amino acid?
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melatonin
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What are the sex steroids?
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estradiol, progesterone, testosterone
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Which hormone is a fatty acid?
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PGF
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What is the biggest class of hormones?
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proteins
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What are the 2 smallest hormone classes?
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sex steroids and fatty acid
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Which 2 hormone classes cannot be given orally and why?
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polypeptide and protein hormones; the peptide bonds
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What are 4 factors that influence the timing of puberty?
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hormonal
genetics nutrition environment |
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What are ways that puberty might be measured in a heifer?
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age at 1st heat
age at 1st ovulation age at which she can support pregnancy |
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What are ways that puberty might be measured in a bull?
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age at first ejaculation
age when sperm appear in the ejaculate age when sperm appear in the urine age when ejaculate contains a threshold number of sperm |
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How do GnRH pulses change at the onset of puberty?
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1. Increase in pulse frequency and amplitude
2. increase in FSH and LH pulses 3. folliculargenesis and spermatogenesis occur |
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What does the GnRH surge cause in females?
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estrus
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