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Biology
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Explain how the respiratory system changed during the development from fish to insects to mammals. 

Feb 22nd, 2015

In fish and many invertebrates, respiration takes place through the gills.

Most insects breath passively through their spiracles (special openings in the exoskeleton) and the air reaches the body by means of a series of smaller and smaller pipes called 'trachaea' when their diameter is relatively large and 'tracheoles' when their diameter is very small.

Ventilation occurs under the control of the autonomic nervous system from parts of the brain stem, the medulla oblongata and the pons.

http://en.wikipedia.org/wiki/Respiratory_system


Feb 22nd, 2015

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Feb 22nd, 2015
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Feb 22nd, 2015
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