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The Easy Quiz (RV) - IPY

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jaytea
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Re: The easy quiz (RV)

Unread post by jaytea » Wed Dec 11, 2013 8:55 am

How long can a crocodile stay under water and by what mechanism?
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Phokojwe
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Re: The easy quiz (RV)

Unread post by Phokojwe » Wed Dec 18, 2013 2:59 pm

Generally 10-15 minutes but it can remain submerged for up to 30 minutes.

This is done by the change in blood circulation, slow blood flow, reduced body temperature and metabolic speed. The heart rate as a result also slows down to 2-3 beats per minute.
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Philip1
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Re: The easy quiz (RV)

Unread post by Philip1 » Wed Dec 18, 2013 3:33 pm

They normally dive for only a few minutes, but will stay underwater for up to 30 minutes if threatened, and if they remain inactive they can hold their breath for up to two hours.

They have a four-chambered heart, although modified for their ectothermic nature due to an elongated cardiac septum, physiologically similar to the heart of a bird, which is especially efficient at oxygenating their blood.
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Philip1
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Re: The easy quiz (RV)

Unread post by Philip1 » Fri Dec 27, 2013 9:38 am

Jaytea :hmz:
"Lose yourself in Nature and find Peace!" (Ralph Waldo Emerson)
UNITE AGAINST POACHING...What we protect,
do not let poachers take it away!

Extinction is forever and survival is up to---every last one of us!

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jaytea
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Re: The easy quiz (RV)

Unread post by jaytea » Sun Jan 12, 2014 6:28 am

Sorry guys! Offline for the silly season!
Phokojwe you're it!
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Re: The easy quiz (RV)

Unread post by onewithnature » Mon Jan 13, 2014 1:59 am

Phokojwe :clap:
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