Human reproduction

The presentation was too long. I divided it into two halves:the reproductive systems and the reproductive process.
Finish these sentences:
Testes can not produce sperm until ...
If a mature ovule does not meet with a mature spermatozoid,then...
The previous affirmation is related to the menstruation because...
Labour stages are:...
After birth we have belly button because...

The reproductive systems

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The reproductive process

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Write a comment and explain a new thing you have learnt from the presentations.

The respiratory system

In this presentation you can observe how our lungs get the oxygen we need to live.

The respiratory system

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What is the meaning of :"exchange of gases". Which are the gases (involved in this process)?

The nervous system.

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Watch it carefully to discover how this system works...

Nervous system

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What is a neuron? What is its function?

Our nervous system

Learn ten new words related with this topic.