WEBVTT

00:05.905 --> 00:08.241 position:10% line:85% size:80%
JOAN CARTAN-HANSEN, HOST: Your
digestive system does some

00:08.241 --> 00:09.409 position:10% line:85% size:80%
pretty amazing stuff.

00:09.409 --> 00:11.911 position:10% line:85% size:80%
Saliva is produced in your mouth
to help dissolve the food you

00:11.911 --> 00:12.812 position:10% line:85% size:80%
chew.

00:12.812 --> 00:15.115 position:10% line:85% size:80%
The average person produces
about two pints of saliva a day.

00:15.115 --> 00:16.416 position:10% line:85% size:80%
KID: Ewwww!

00:16.416 --> 00:18.551 position:10% line:85% size:80%
CARTAN-HANSEN: Your body can
move your food through the

00:18.551 --> 00:20.453 position:10% line:85% size:80%
digestive system even while you
are standing on your head.

00:20.453 --> 00:22.355 position:10% line:85% size:80%
That's because digestion works
with muscles moving the food

00:22.355 --> 00:23.323 position:10% line:85% size:80%
along.

00:23.323 --> 00:24.457 position:10% line:85% size:80%
It doesn't need gravity.

00:24.457 --> 00:27.026 position:10% line:85% size:80%
The small intestine is about 22
to 23 feet long, while the large

00:27.026 --> 00:29.429 position:10% line:85% size:80%
intestine is only about 5 feet
long.

00:29.429 --> 00:32.399 position:10% line:85% size:80%
Stomach growling is called
borborygmic (stomach growling)

00:32.399 --> 00:34.567 position:10% line:85% size:80%
It happens all the
time, but it's louder when your

00:34.567 --> 00:36.836 position:10% line:85% size:80%
stomach is empty because there
is no food to muffle the sound.

00:36.836 --> 00:40.774 position:10% line:85% size:80%
And when your stomach is empty,
it's about the size of a fist.

00:40.774 --> 00:42.008 position:10% line:85% size:80%
But your stomach can stretch.

00:42.008 --> 00:45.712 position:10% line:85% size:80%
It can hold up to 4 pounds of
food at one time.

00:45.712 --> 00:47.947 position:10% line:85% size:80%
And if you want to keep a
healthy digestive system, go for

00:47.947 --> 00:49.015 position:10% line:85% size:80%
a run.

00:49.015 --> 00:51.885 position:10% line:85% size:80%
Aerobic exercise is the best
type of exercise to keep your

00:51.885 --> 00:53.086 position:10% line:85% size:80%
digestive tract in shape.

00:53.086 --> 00:56.256 position:10% line:85% size:80%
For more information about the
digestive system check out the

00:56.256 --> 00:57.357 position:10% line:85% size:80%
Science Trek website.

00:57.357 --> 01:03.196 position:10% line:85% size:80%
You'll find it at Science Trek
dot org