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4.11 The placenta
Exam question
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Explain how the placenta is adapted for exchange between mother and fetus.
(3)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 3 marks
4.11 The placenta
Exam question
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Name two substances that pass from the mother to the fetus across the placenta.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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Name two substances that pass from the fetus to the mother.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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Explain why the blood of the mother and fetus do not mix.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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Explain why smoking during pregnancy can reduce the birth mass of a baby.
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Total for this question: 2 marks
4.11 The placenta
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Explain why some drugs and viruses can harm a fetus.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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Which vessel carries blood from the fetus to the placenta?
(1)Total for this question: 1 mark
4.11 The placenta
Exam question
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Illustrative data.
| Cigarettes smoked by mother per day | Mean birth mass / kg |
|---|---|
| 0 | 3.40 |
| 1–10 | 3.20 |
| 11–20 | 3.05 |
| over 20 | 2.90 |
Calculate the percentage decrease in birth mass for babies of mothers smoking over 20 a day compared with non-smokers.
(2)Total for this question: 2 marks
4.11 The placenta
Exam question
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| Cigarettes smoked by mother per day | Mean birth mass / kg |
|---|---|
| 0 | 3.40 |
| 1–10 | 3.20 |
| 11–20 | 3.05 |
| over 20 | 2.90 |
Describe the relationship shown in the table.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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Explain why antibodies passing across the placenta help the newborn baby.
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Total for this question: 2 marks
4.11 The placenta
Exam question
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State the name of the cord that connects the fetus to the placenta.
(1)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 1 mark
