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Lecture

HSCI 1120 Lecture Notes - Ejaculatory Duct, Paramesonephric Duct, Luteinizing Hormone

by

Department
Health Sciences
Course Code
HSCI 1120
Professor
C.Stewart

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Sex Hormones
Male Sex Hormones
Testes
Testosterone
o Sperm producing capability and maintaining genitals
o Stimulating and maintaining the secondary sex characteristics (such
as beard growth)
o Stimulating the growth of bone and muscle
Pituitary
Follicle-stimulating hormone (FSH)
o Controls sperm production
Luteinizing hormone (LH)
o Controls testosterone production
Hypothalamus
Gonadotropin-releasing hormone (GnRH)
o Secreted by hypothalamus
Regulate the pituitary which releases LH and FSH

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Female sex hormones
Ovaries
Estrogen
o Brings many of the changes of puberty (stimulating the growth of the
uterus and vagina, enlarging the pelvis, and stimulating breast
growth)
o Responsible for maintaining the membranes of the vagina and
stopping bone and muscle growth
Progesterone: important hormone for
Pituitary
Follicle-stimulating hormone (FSH)
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Luteinizing hormone (LH)
Prolactin
o Stimulates milk production by mammary glands after women gives
birth
Oxytocin
o Stimulates ejection of that milk from the nipple
o Stimulates contractions of the uterus during childbirth
Hypothalamus
Gonadotropin-releasing hormone (GnRH)
When GnRH is produced pituitary is stimulated to produce LH and FSH
Prenatal Sexual Differentiation
Sex chromosomes
XX=female
XY=male
XXY=Klinefelter’s Syndrome
Sex chromosomes carry information on how to differentiate in the course
of development
Gonads & Pre-natal hormones
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