|
Digesting Grasses
|
|
|
Welcome Teachers and Students
Visit
Our Archives
How to
Ask a Question
Ask
A Question
Question
of the Week
Our
Expert Scientists
About
Ask A Scientist
Referencing
NEWTON BBS Articles
Frequently Asked Questions |
Digesting Grasses
name Kaede
status other
grade other
location N/A
Question - why can cows digest grasses while persons don't?
----------------------------------------------------------------
They have a complex digestive system designed for slow digestion and
also have a microbe that breaks down the cellulose sugar that makes up
grass. Humans posess neither the digestive system nor the enzyme to
live off of grass and such.
PF
====================================================================
Cows don't actually digest grass, which contains cellulose. They have
a ruminant stomach, which means that their stomach is
compartmentalized. Some would say they have more than one stomach.
But in one of the "stomachs" they have bacteria which are able to
break a specific chemical bond in cellulose that breaks it down into
glucose. This is an example of mutualistic symbiosis, where both
organisms benefit from a relationship. The cow benefits by being able
to take advantage of a food source, and the bacteria get a ready
supply of food and protection. Did you know that termites can't
digest wood? They also have organisms living in their guts that break
down the cellulose in wood.
vanhoeck
====================================================================
|
|
We provide a means to have questions answered that are not going to be easily found on the web or within common references.
Return to NEWTON's HOME PAGE
For
assistance with NEWTON contact a System Operator, at Argonne's Division
of Educational Programs
NEWTON
BBS AND ASK A SCIENTIST Division of Educational Programs
Building
DEP/223 9700 S. Cass Ave. Argonne,
Illinois 60439-4845
USA
Last
Update:
January 2007
|