Science
A developing fetus is connected to the placenta by means of umbilical cord. The Umbilical vein and artery run inside the umbilical cord.
(a) Name two substance that moves through the blood vessels.
(b) If the placenta has less villi how will it affect the baby’s growth?
(c) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby.
(d) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome.
(i) What is the sex of the foetus?
(ii) How is this prenatal sex determination misused?
Reproductive System
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Answer
(a) The two main substances that move through the blood vessels in the umbilical cord are oxygen and nutrients.
(b) If the placenta has fewer villi, the surface area for exchange of materials between the mother and the fetus is reduced which means that less oxygen and nutrients can reach the developing baby and less waste can be removed. As a result, the growth and development of the baby will be slowed down or stunted and it may lead to poor health or low birth weight.
(c) The embryo develops inside the uterus of the female body. The uterus is well adapted for nourishing the baby as its inner lining (endometrium) is thick, soft, and richly supplied with blood vessels, which provide nutrients and oxygen to the developing embryo.
(d)
(i) The presence of XY chromosomes indicates that the foetus is male.
(ii) Prenatal sex determination is misused in some cases for female foeticide where female foetuses are aborted due to a preference for male children.
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(a) Name two substance that moves through the blood vessels.
(b) If the placenta has less villi how will it affect the baby’s growth?
(c) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby.
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