Placenta And Some Of IT's Functions
This is a quiz to test your knowledge about placenta and some it's function and/or update your knowledge.
Enjoy!
- 1.
Which cells of the blastocyst need to invade the endometrium for the placenta to form?
- A.
Ectoderm
- B.
Mesoderm
- C.
Inner cell mass
- D.
Syncitiotrophoblast
Correct Answer
D. SyncitiotrophoblastExplanation
Syncitiotrophoblast is the outer layer of trophoblast that invades the uterine decidua for the placenta to formRate this question:
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- 2.
The main hormone produced by the placenta that sustains the pregnancy is:
- A.
Oestrogen
- B.
Beta Human Chorionic Gonadotrophin
- C.
Progesterone
- D.
Human Placental Lactogen
Correct Answer
C. ProgesteroneExplanation
Progesterone is the hormone that ensure the continuation of pregnancy.Rate this question:
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- 3.
The blood flow through the placent at term is:
- A.
200-300l/min
- B.
400-500l/min
- C.
600-700l/min
- D.
800-900l/min
Correct Answer
C. 600-700l/minExplanation
By term (37-42 weeks of pregnancy) the amount of blood flow in the placenta every minute is 600-700l.Rate this question:
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- 4.
Oxygenated blood from the placenta to the baby is carried by:
- A.
One umbilical artery
- B.
Two umbilical arteries
- C.
One umbilical vein
- D.
Two umbilical veins
Correct Answer
C. One umbilical veinExplanation
The veins usually carry deoxygenated blood however in pulmonary circulation (Pulmonary veins) and in the umbilical vein it is oxygenated blood that is carried by the vein and de-oxygenated blood by the pulmonary arteries and umbilical arteries.Rate this question:
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- 5.
Deoxygenated blood from the baby to the placenta is carried by:
- A.
One umbilical artery
- B.
Two umbilical arteries
- C.
One umbilical vein
- D.
Two umbilical veins
Correct Answer
B. Two umbilical arteriesExplanation
Just as in pulmonary circulation the de-oxygenated blood is carried by pulmonary arteries from the heart to the lungs the same is true of umbilical arteries - carrying de-oxygenated blood from the baby to the placentaRate this question:
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- 6.
The placenta and the baby evade attack from the mother's immune system by:
- A.
Producing Neurokinin B from the placenta & Lymphocyte Suppressor cells by the baby
- B.
Producing Neurokinin B by the baby
- C.
Producing Lymphocyte suppressor cells by the placenta & the baby
- D.
Producing Neurokinin B by the placenta & the baby
Correct Answer
A. Producing Neurokinin B from the placenta & Lymphocyte Suppressor cells by the babyExplanation
The placenta functions as a major immunological barrier (production of Neurokinin B one example) and the Lymphocyte suppressors are produced by the baby to ensure the pregnancy is not rejected.Rate this question:
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- 7.
The stage of labour when the placenta is birthed is known as:
- A.
First stage of labour
- B.
Second stage of labour
- C.
Third stage of labour
- D.
Fourth stage of labour
Correct Answer
C. Third stage of labourExplanation
First stage of labour is from the onset of contractions to the full dilatation of the cervix (10cm)
Second stage of labour is from full dilatation of the cervix to the birth of the baby
Third stage of labour is from the birth of the baby to the birth of the placenta
Fourth stage of labour is the immediate period following birth of the placenta till transfer to postnatal facilityRate this question:
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- 8.
The uterotonic agent that may be used to actively manage the birth of the placenta is:
- A.
Syntocinon 5IU IV
- B.
Syntocinon 10IU IV
- C.
Syntometrine 1ml IV
- D.
Depends on the woman's preference
Correct Answer
A. Syntocinon 5IU IVExplanation
You can use Syntocinon 10IU and Syntometrine 1ml but these should be administered intramuscularly and NOT intravenously. The woman's preference is important in relation to having the uterotonic agent and the route of administration however the decision has been made to actively manage and the only route offered in the response is IV so the safest response is Syntocinon 5IU IVRate this question:
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- 9.
The cord should be clamped and cut immediately after the birth of the baby:
- A.
True as it causes jaundice in the baby always requiring treatment
- B.
Clamping and cutting the cord is only delayed in preterm infants
- C.
True as it has no role in adaptation for the baby
- D.
Delayed clamping & cutting aids with adaptation for the baby
Correct Answer
D. Delayed clamping & cutting aids with adaptation for the babyExplanation
Evidence suggests that if the baby is vigorous at birth it may be beneficial to delay cord clamping & cutting until cord has stopped pulsating. See the video clip of Delayed cord clamping under "Video Clips" in Information of this siteRate this question:
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- 10.
The placenta has two membranes - Chorion and the amnion. Which cells are responsible for forming these two membranes?
- A.
Chorion is formed by the migrating ectoderm from the embryonic disc while amnion is formed by the cytotrophoblast
- B.
Chorion is formed by the cytotrophoblast while the amnion is formed by the migrating ectoderm from the embryonic disc
- C.
Both membranes are formed by the cytotrophoblast
- D.
Both membranes are formed by the migrating ectoderm from the embryonic disc
Correct Answer
B. Chorion is formed by the cytotrophoblast while the amnion is formed by the migrating ectoderm from the embryonic discExplanation
Cytotrophoblast forms the outer membrane the chorion while the migrating ectoderm from the embryonic disc forms the inner amnionRate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 04, 2012Quiz Created by
Nwaller
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