Maternal Adaptation To Pregnancy

Maternal Adap Tation T
Created Mar 31, 2010
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Side ASide B
How is ventilation increased?
Progesterone is thought to indirectly act on the respiratory centre which increases tidal volume...
What 3 factors affect weight gain?
1/3 - foetus, amnion and placenta 1/3 - uterus and breast, blood and tissue fluid 1/3 - increased...
Why does plasma volume increase?
There is fluid retention due to the high concentration of salt retaining hormones such as progesterone,...
Why does the Hb concentration increase?
The bone marrow produces more RBC's in response to increased oxygen consumption.
Why does BP stay the same?
Because the increase in CO due to increased SV, HR, and blood volume is offset by decreased...
Does urine output increase of decrease?
It increases due to the increased excretory load.
Is there salt loss?
No, because the salt loss due to the 60% increased GFR and the salt losing hormones is compensated...
How is the uterus prevented from contracting during pregnancy?
The membrane of myometrial cells is hyperpolarised which means that it is not near the threshold...
What are braxton-hicks contractions?
Myometrial cells gradually depolarise towards term, and they near the contraction threshold....
What role do acid mucopolysaccharides play in the softening and stretching of the cervix.
Oestrogen and relaxin causes them to retain water which decreases the adhesion between...
What is role of a) the corpus luteum (b) the chorion of the placenta in oestrogen...
a) Secretes oestrogen and progesterone for the first 3-4 months of pregancy b) Secretes oestrogen...
List 4 functions of progesterone
1. Prevents myometrial contractions 2. Prevents menstruation 3. Prevents ovulation 4....
List 2 functions of oestrogen
1. Relaxation of pubic sympthesis 2. Works along with hPL to prepare the breasts for lactation
Where is relaxin produced and what does it do?
It is produced in the corpus luteum and then the chorion of the placenta. It causes relaxation...
Where is human placental lactogen produced?
Chorion in proportion to the size of the placenta
List four function hPL
1. Prepare mammary tissue for lactation 2. Stimulate maternal growth - protein synthesis 3....
Where is corticotrophin releasing hormone produced and what does it do.
It is released by the chorion and its production increase throughout pregnancy and it is thought...
Describe the pattern of human chorionic gonadotrophin release.
It is released by the chorion and it peaks around week 9 then declines as placenta assume role...
List two functions of hCG and what regulates its release.
1. Maintains the corpus luteum 2. Immunosuppressive Release stimulated by FSH and LH

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