A doctor uses the scan in Fig. 1 to discuss an early pregnancy with a patient. The developing fetus is inside a fluid-filled sac in the uterus. A cord conne...
Question 1 Report
A doctor uses the scan in Fig. 1 to discuss an early pregnancy with a patient. The developing fetus is inside a fluid-filled sac in the uterus. A cord connects the fetus to a disc-shaped placenta attached to the uterine wall. Substances pass between the mother’s blood and the fetus without their blood normally mixing directly.
(a) Identify the structure labelled X. [1]
(b) Identify the structure labelled Y. [1]
(c) Explain how oxygen reaches the fetus from the mother. [2]
(d) Give one substance, other than oxygen, that moves from mother to fetus. [1]
Answer Details
(a) X = placenta [1] (b) Y = umbilical cord [1] (c) Oxygen diffuses from the mother's blood into fetal blood at the placenta [1]; it is carried to the fetus in the blood of the umbilical cord [1] (d) Glucose / amino acids / water / antibodies [1]
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