THE BLOWHOLE

 

 

Dolphins have one blowhole which is located at the top of the dolphins head, through which they breath through. Dolphins cant breath under water, they need to come to the surface to take their breath. The nostril is their blowhole and only opens when it reaches the surface and then closes when the dolphin dives back down holding its breath. A dolphin can holds its breath under water for up to 30 minutes at one time.

 

Muscle contractions causes the flap to open

 

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The relaxation of the muscle allows the flap to close into a water tight seal.

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This web-site is protected under international copyright laws and is the propertyof Carol Medder.  Any unauthorised copying or transmission of its contents in full or in part is prohibited without prior permission of the author.  Schools, colleges and universities are allowed to use the contents for educational purposes.

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