Have you ever thought about what happens to
your lunch after you swallow it? Where does it go? How
does it help you to grow? This process is called the digestive process.
There are many steps in this process that involve many different parts
of your body.
Digestion begins before you ever put the food into your mouth. When
you smell food, you begin to salivate, or get a lot of spit in your mouth.
(Yuck)! When you salivate, your salivary glands release enzymes (chemicals
that help to break food down into smaller parts) into your saliva.
Your body is preparing itself to take that first bite!
Digestion continues in your mouth as you take your first bite. Your
tongue and your teeth chomp and smash the food into tiny little pieces.
Chewing your food serves at least two purposes. First, it keeps you
from choking when you swallow, and that's always a good thing! Second,
it helps the enzymes to break down the food faster. Your mouth is
where you begin to digest carbohydrates, nutrients that are found in bread,
grain, starch, pasta, fruit, vegetables, and anything else with sugar in
it.
After you swallow your food it enters your esophagus. Your esophagus
is a long tube that connects your mouth to your stomach. The food
you eat is pushed through the esophagus as little muscles around your esophagus
push the food into the stomach. These little muscle movements are
called peristalsis.
When your food gets to the bottom of your esophagus, it enters your stomach.
Your stomach is full of an acid called hydrochloric acid. Hydrochloric
acid helps your stomach to break down proteins, nutrients that are found
in meat and beans. Your body needs acid to break down proteins, because
proteins are very strong. They are so strong that they don't come
apart easily.
Next, your food goes into the first part of your small intestines, we call
this part the duodenum. Your pancreas, liver, and gallbladder release
lots of enzymes into your small intestines through small tubes, which are
called ducts. These enzymes help your body to finish breaking down
the carbohydrates and to start breaking down lipids. You might have
also heard lipids called fats; they're the same thing. Your small
intestines are lined with villi. Villi are like little fingers that
help your body to absorb all the yummy nutrients that are being broken
down. When the villi absorb the nutrients, they send the nutrients
to your bloodstream, so the rest of your body can be nice and healthy.
The food that is left over moves on to your colon or your large intestines.
Not too much happens here. Your colon helps to absorb left over water
and few nutrients here and there. Mostly, your colon takes all the
left over food and turns it into feces. You might know feces by another
name: poop.
The journey ends when you go to the bathroom. The feces passes through
your anus and then your rectum. After that, we all know it goes into
the toilet, and the sewer from there.