Placenta And Some Of IT's Functions

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1. The stage of labour when the placenta is birthed is known as:

Explanation

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 facility

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About This Quiz
Reproductive System Quizzes & Trivia

This is a quiz to test your knowledge about placenta and some it's function and/or update your knowledge.
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2. Deoxygenated blood from the baby to the placenta is carried by:

Explanation

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 placenta

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3. Oxygenated blood from the placenta to the baby is carried by:

Explanation

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.

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4. Which cells of the blastocyst need to invade the endometrium for the placenta to form?

Explanation

Syncitiotrophoblast is the outer layer of trophoblast that invades the uterine decidua for the placenta to form

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5. The main hormone produced by the placenta that sustains the pregnancy is:

Explanation

Progesterone is the hormone that ensure the continuation of pregnancy.

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6. The cord should be clamped and cut immediately after the birth of the baby:

Explanation

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 site

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7. The placenta has two membranes - Chorion and the amnion. Which cells are responsible for forming these two membranes?

Explanation

Cytotrophoblast forms the outer membrane the chorion while the migrating ectoderm from the embryonic disc forms the inner amnion

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8. The placenta and the baby evade attack from the mother's immune system by:

Explanation

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.

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9. The blood flow through the placent at term is:

Explanation

By term (37-42 weeks of pregnancy) the amount of blood flow in the placenta every minute is 600-700l.

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10. The uterotonic agent that may be used to actively manage the birth of the placenta is:

Explanation

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 IV

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The stage of labour when the placenta is birthed is known as:
Deoxygenated blood from the baby to the placenta is carried by:
Oxygenated blood from the placenta to the baby is carried by:
Which cells of the blastocyst need to invade the endometrium for the...
The main hormone produced by the placenta that sustains the pregnancy...
The cord should be clamped and cut immediately after the birth of the...
The placenta has two membranes - Chorion and the amnion. Which cells...
The placenta and the baby evade attack from the mother's immune...
The blood flow through the placent at term is:
The uterotonic agent that may be used to actively manage the birth of...
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