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Unit 9 LA C Hormonal control of reproduction
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- PEARSON (PEARSON)
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Unit 9 LA C Hormonal control of reproduction UnknownHormonal control of reproduction
Male reproductive anatomy
Figure 1 (above) shows a labelled diagram of the male reproductive system and the
structure of each part.
Female reproductive anatomy
Figure 2 (above) shows the female reproductive system and labelled structure and
function of each part
,Unit 9 LA C Hormonal control of reproduction Unknown
Part C.P3 Awarded
Describe how hormones are involved in gamete development and conception
Production of sperm
When puberty begins the hypothalamus secretes high levels of GnRH in response to that
the anterior pituitary gland releases FSH (follicle stimulating hormone) and LH (luteinizing
hormone) into the males system for the first time (“Hormonal control of human
reproduction I Boundless Biology” , n.d.). FSH enters the testes stimulating the sertoli are
responsible for the production of the hormone inhibin. when sperm count is too high
inhibin is released into the blood.these nourish sperm cells and start spermatogenesis.
LH, which encourages leydig cells to generate and release testerone into the blood and
testes, is another hormone that enters the testes.(“Hormonal control of human
reproduction I Boundless Biology” , n.d.).Testosterone causes secondary sexual traits in
men, such as deepening of voice, facial hair development, pubic hair growth, and the
onset of sex urge and increased height. The rise in testosterone restricts the release of
GnRH, FSH and LH so negative feedback occurs in the hypothalamus and in the anterior
pituitary (“Hormonal control of human reproduction I Boundless Biology” , n.d.).
Figure 3 (above) shows the production of sperm and the hormones involved
in this production
Production of Ova
Begins before birth in females. Takes place in ovaries. Oogonia is divided by mitosis to
form primary oocytes. FSH stimulates the production of ova, which develop into follicles,
which are structures that contain egg cells.During puberty, one follicle each month will
, Unit 9 LA C Hormonal control of reproduction Unknown
mature to form graafian follicle (“24.4. Hormonal Control of Human Reproduction –
Concepts of Biology – 1st Canadian Edition”, n.d.). The primary meiotic division of the
graafian follicle's primary oocyte is completed, leading in the production of a secondary
oocyte.The secondary meiotic division occurs when a sperm penetrates the secondary
oocyte during fertilisation.Inhibin, a hormone that regulates FSH synthesis, is produced by
folicle cells. Ovarian development, ovulation induction, and the stimulation of estradiol and
progesterone synthesis in the ovaries are all influenced by LH.(“24.4. Hormonal Control of
Human Reproduction – Concepts of Biology – 1st Canadian Edition”, n.d.).Estradiol and
progesterone are steroid hormones that help the body prepare for pregnancy.Estradiol is a
female reproductive hormone that regulates secondary sexual traits as well as endometrial
regeneration, ovulation, and calcium absorption. Breast development, hip flaring, and a
quicker bone maturation period are just a few examples. Progesterone promotes
endometrial regeneration while inhibiting FSH and LH production (“24.4. Hormonal Control
of Human Reproduction – Concepts of Biology – 1st Canadian Edition”, n.d.).
Figure 4 (above) shows the hormones involved in the production of ova.
Conception
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