Re: Isn't Water Like Zero Gravity?
- From: pete <pfiland@xxxxxxxxxxxxxx>
- Date: Wed, 15 Jun 2005 19:52:15 GMT
Su Solomon wrote:
> Their bones are very light and principally very
> "open weave" cancellous
> bone, not much marrow cavity, if any at all. Comparing marine mammal
> bones to terrestial mammal bones is like comparing honey comb to a bar
> of chocolate.
http://www.oceanicresearch.org/manaspt.html
"Here we have a manatee rib.
Manatees don't make their bone marrow in their ribs,
they make it in their backbones,
so these ribs are really heavy.
Many manatees die each year from being hit by boats
and then the ribs are fractured and puncture the lungs.
These ribs are really heavy and its hard to imagine
the force required to break one of these ribs."
-Betsy Dearth, Park Ranger, Homosassa Springs State Wildlife Park
http://www.mesa.edu.au/ask/display.asp?id=842
For diving mammals such as whales,
they have a variety of strategies
such as thick rib cages
and collapsible lungs that allow
them to cope with the pressure changes.
--
pete
.
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