Worksheet 2


Menstrual Cycle

1.         (a)       Give the full name of the female hormone below:
                                          i.    FSH
                                        ii.    LH
                                       iii.    GnRH

            (b)       Which one of these hormones is is secreted by the hypothalamus?

            (c)        What is its target organ?


2.         The diagram below shows the development of a follicle during the menstrual cycle.

 

Place the letter to the diagrams above that corresponds to the following descriptions.

(a)  Has recently been affected by LH
(b)  Is affected by FSH
(c)  Is degenerating
(d)  Is filled with fluid
(e)  Secretes most oestrogen
(f)   Secretes most progesterone


3.         These graphs show typical hormonal changes for a woman in her late 20s.

 

(a)       Oestrogen has different effects depending on its concentration.

(i)         Put a S on the graph whenever oestrogen stimulates LH secretion.

                        (ii)        Put an I at a point where oestrogen inhibits LH secretion.

            (b)       FSH causes new follicles to develop.

                        Put a F whenever FSH is acting on a new follicle.

            (c)        Menstruation begins when the progesterone level falls.

                        Put a M whenever menstruation begins.



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