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11 Cards in this Set
- Front
- Back
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The fetal heart rate is controlled by the ______________(___) node. It is mediated by ________ stimulation in the __________ nervous system and innervation from the ________________ nervous system. |
The fetal heart rate is controlled by the sinoatrial(SA) node. It is mediated by vagal stimulation in the parasympathetic nervous system and innervation from the sympathetic nervous system. |
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Beat to beat changes in the fetal heart rate is called ______________. |
variability. |
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Feto placental circulation depends on.... |
adequate spiral artery flow into the intervillous space. |
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Contractions cause _______________ of the spiral arteries, leading to.... |
Vasoconstriction, interrupted flow into the intervillous space. |
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Blood flow to the fetus should... |
remain unchanged throughout a contraction. |
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The umbilical cord contains... |
2 arteries which carry deoxygenated blood from the fetus to the placenta, and 1 vein which carries oxygenated blood to the fetus from the placenta. |
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Repetitive cord compression in labour can cause fetal _____________. |
Bradycardia. |
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Oxygen and Carbon Dioxide can readily __________ across placental _______________. |
Oxygen and Carbon Dioxide can readily diffuse across placental membranes. |
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During a contraction the myometrium.... |
compresses the spiral arteries leading to less blood flow into the intervillous space. |
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In contraction less ________ diffuses in and less _________ diffuses out, hence the oxygen concentration _________ and the carbon dioxide concentration _____________. |
In contraction less oxygen diffuses in and less carbon dioxide diffuses out, hence the oxygen concentration decreases and the carbon dioxide concentration increases. |
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The fetus begins to __________________ carbon dioxide, which when mixed with H2o creates ______________. The pH of the fetus then ______________ and the fetus is in a state of ________________. This stimulates the ____________ ________________ ___________. |
The fetus begins to accumulate carbon dioxide which when mixed with H2o creates carbonic acid. The pH of the fetus then drops and the fetus is in a state of acidosis. This stimulates the fetal respiratory centre. |
