BIO5 chapter 13 - feedback mechanisms revision notes

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  • Created on: 04-03-13 21:03
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Feedback mechanisms
Homeostatic control of any feedback system:
Set point
Receptor ­ detects deviation
Controller ­ coordinates information
Effector ­ returns system to set point
Feedback loop ­ informs receptor of changes

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Control of oestrous cycle
In female mammals
Controlled through interaction of different hormones that travel in blood plasma
Menstrual cycle in humans only
Hormonal control of menstrual cycle
2 hormones released from PITUATARY GLAND ( brain) :
FSH ( follicle ­ stimulating hormone) : STIMULATES development of follicles in ovary, and
stimulates follicles to PRODUCE OESTROGEN.
LH ( luteinising hormone) : causes OVULATION to occur, STIMULATES ovary to produce
PROGESTERONE from CORPEUS LUTEUM.…read more

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Progesterone maintains thick lining and inhibits release of FSH and LH
8. Egg not fertilised = corpus leuteum degenerated = progesterone decreases
9. Lining of uterus breaks down ­ MENSTRUATION = FSH NO LONGER INHIBITED
10.…read more

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