Absence of ribs in frogs?
stada at ix.netcom.com
Sun Feb 26 13:28:08 EST 1995
I'm a biology instructor at a junior college in Miss. A zoology student
of mine, as we were dissecting frogs, asked why frogs didn't have ribs.
Some amphibians do and some (frogs) don't. The possibilites I came up
with where: (1) frogs respire with positive pressure differential and
don't need ribs or a diaphragm (used in negative pressure respiration);
(2) ribs are for lateral support of musculature and thoracic cavities--a
frog's belly is on the ground and doesn't need any support; and (3)
lastly as a possible weight-saving device related to jumping.
Any other thoughts?
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