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Before a Baby is Born

In this worksheet, students will review their understanding of the stages of pregnancy, the nurturing of the baby in the womb and how it is protected.

'Before a Baby is Born' worksheet

Key stage:  KS 3

Curriculum topic:   Biology: Structure and Function of Living Organisms

Curriculum subtopic:   Reproduction

Difficulty level:  

Worksheet Overview

After the egg is fertilised, the baby develops inside the mother until it is time for it to be born.

 

How does it grow? Does it feed or breathe? What happens if the pregnant Mum trips over?

 

These are the sorts of questions that we'll be exploring in this worksheet.

 

Do you remember that a woman's menstrual cycle is a regular monthly cycle and that the point at which the gametes (like sperm and egg) meet is called fertilisation and in mammals that happens in the OVIDUCTS or FALLOPIAN TUBES?  However, it is the UTERUS (or womb) that sustains the EMBRYO as it grows inside and a special organ develops there to supply all the baby's needs and to take away its wastes - that organ is called the PLACENTA.

 

As the embryo grows, and begins to resemble the young mammal it's going to become, it is called a FETUS (or foetus).  What sort of things do you think it needs that the placenta supplies?  Things like oxygen and food, for example.  What sort of wastes does the placenta remove?  Wastes like CO2 and urea (which forms urine).  The young mammal is joined to the placenta by an UMBILICAL CORD along which the chemicals flow (in and out) through blood vessels.  Wonderfully the fetus floats in a fluid-filled sac which protects it from the knocks and bangs which are a normal part of the pregnant mum's life.  This is called the AMNIOTIC SAC and the fluid inside?  AMNIOTIC FLUID.  It's brilliant at absorbing shocks.

 

Hopefully this information together with what you've already been learning about mean that you're ready to check out how sorted you are with the vital knowledge of what happens inside a mum's body before the youngster is born.  Let's see......

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