TOPIC 20 DAY 2 HUMAN DEVELOPMENT

A fertilized egg undergoes several stages before it is successfully implanted. The diagram above shows these stages as the fertilized egg travels through the female reproductive system.

In which of the following structures of the female human reproductive system is the blastocyst implanted during normal human development?

• ovary

• uterus

• vagina

• cervix

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Which of the following structures is correctly paired with its function?

• Umbilical cord - Circulates maternal blood through the fetus.

• Placenta - Passes nutrients from the mother to the fetus.

• Amniotic sac - Provides an air supply for the fetus to use.

• Uterus - Protects the fetus from harmful substances in the mother's blood

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The point at which the umbilical cord attaches to the fetus becomes the belly button after birth. What is the function of the umbilical cord for mother and fetus during fetal development?

• Liquids consumed by the mother flow through the umbilical cord and into the stomach of the fetus.

• Waste products produced by the fetus travel through the umbilical cord and out through the mother’s kidneys.

• Part of any food consumed by the mother passes from the mother’s stomach, through the umbilical cord, and into the stomach of the fetus.

• Nutrients from foods digested by the mother pass from her blood to the fetus through blood vessels in the umbilical cord.

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Which of the following describes part of a baby's development in the second trimester of pregnancy?

• The fetus turns into a head-down position in the uterus.

• The fetus develops fat under the skin and practices breathing movements.

• The fetus is in the embryonic stage, and the amniotic sac forms.

• The fetus grows soft hair called lanugo over its skin and can swallow and hiccup.

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Which of the following sequences correctly describes prenatal development?

• blastocyst implants in uterus, zygote forms, heart begins beating, lungs can breathe air, sex organs become visible

• blastocyst implants in the uterus, zygote forms, heart begins beating, sex organs become visible, lungs can breathe air

• zygote forms, blastocyst implants in the uterus, heart begins beating, sex organs become visible, lungs can breathe air.

• zygote forms, blastocyst implants in the uterus, sex organs become visible, heart begins beating, lungs can breathe air.

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