Llb Law Neglience Tort Essay

Answers to control of mammalian oestrous
1. (a) Around twenty-four hour period 2 / sidereal day 20;
Coincides with LH / follicle-stimulating hormone peak;2

(b) (No) / (no mark for no)
progesterone levels fail;1

[3]




2. (a) FSH stimulates rebelth of a follicle;
Developing follicle produces estrogen;
(FSH) and LH bring about ovulation / oestrus;
LH stimulates constitution of corpus luteum;
LH stimulates production of progesterone;
Fall in LH / FSH means oestrogen production no longer stimulated;5 max

(b) (i) Progesterone inhibits FSH;
No follicles develop;



(ii) Causes rise in FSH / inhibition of FSH removed;
Stimulates follicle development;4

[9]





3. (a) (i) LH peaks/is high (on day 12):1

(ii) spermatozoon suffer survive up to 2-7 days;

Eggs can survive few hours/ up to 3 days;

OR General idea of short-lived gametes (e.g. a few days) = max.



1 mark2



(b) (i)1nhibits (release of) FSH;

Follicle does not develop/mature/grow/prevent ovulation/

FSH causes follicles to develop; (Allow: ovum not produced)

[Reject: indication to follicle production]2

(ii)Progesterone;1

[6]



4. (a)Any two from:
Follicle diameter/ surface drops suddenly on day 21/at this snip;
Egg/ovum/oocyte released from follicle (causes size decrease);
Corpus luteum formed on day 21/at this time;max 2
[Note: upper limit 1 mark if no time given]

(b)On day 18 oestrogen peaks/at 6.0/rises to highest value;
= 1 day before start of oestrus; 2



(c)Size and concentration state a positive correlation/described;
Corpus luteum produces progesterone; 2




(d)Any six from:
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