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Paper 4Theory (Extended)3 marks
During pregnancy, the fetus depends on the mother for oxygen and nutrients and needs to remove waste products efficiently.
Description
Exchange of Substances
The placenta contains many blood vessels and is connected to the fetus by the umbilical cord, which contains two arteries and one vein.
- a[1]
Identify the blood vessel in the umbilical cord that carries oxygenated blood to the fetus.
Aim for approximately 1 distinct marking point.
- b[2]
Describe how waste products are removed from the fetus.
Aim for approximately 2 distinct marking points.
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