What is meant by the term amnion?
Reveal answer
Membrane surrounding the embryo/fetus and amniotic fluid.
Key words: amnion
4(a) REPRODUCTION · RECALL
4.12 Amniotic fluid
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What is meant by the term amniotic fluid?
Reveal answer
Fluid surrounding the developing fetus within the amnion.
Key words: amniotic fluid
What is meant by the term cushioning?
Reveal answer
Reduction of concentrated mechanical force by spreading pressure.
Key words: cushioning
What is meant by the term fetus?
Reveal answer
Developing human after the embryonic stage until birth.
Key words: fetus
Structures supporting development, Amnion. Main role? Not its main role?
Reveal answer
Main role: Encloses the fluid-filled sac. Not its main role: Placental exchange.
Key words: Amnion
Structures supporting development, Amniotic fluid. Main role? Not its main role?
Reveal answer
Main role: Cushions and permits movement. Not its main role: Supplying oxygen/nutrients.
Key words: Amniotic fluid
Structures supporting development, Placenta. Main role? Not its main role?
Reveal answer
Main role: Exchange with maternal circulation. Not its main role: Direct mechanical cushioning.
Key words: Placenta
Structures supporting development, Umbilical cord. Main role? Not its main role?
Reveal answer
Main role: Carries fetal blood to/from placenta. Not its main role: Mixing maternal and fetal blood.
Key words: Umbilical cord
Structures supporting development, Uterine muscle/wall. Main role? Not its main role?
Reveal answer
Main role: Contains and later contracts during birth. Not its main role: Producing fetal blood.
Key words: Uterine muscle/wall
True or false, and why? “The fetus breathes amniotic fluid for oxygen.”
Reveal answer
False. Oxygen reaches fetal blood through placental exchange.
True or false, and why? “Amniotic fluid is inside the placenta.”
Reveal answer
False. It surrounds the fetus inside the amniotic sac.
True or false, and why? “The fluid makes injury impossible.”
Reveal answer
False. It reduces mechanical stress but cannot remove all risk.
What protects a developing fetus from knocks?
Reveal answer
Amniotic fluid.
Key words: amniotic fluid
Which membrane holds the amniotic fluid?
Reveal answer
The amnion (amniotic sac).
Key words: amnion
How does amniotic fluid protect the fetus?
Reveal answer
The fluid cushions the fetus against bumps and lets it move freely.
Key words: cushions