00:01
Hello! We’re going to discuss
the GI system today.
00:05
We’re going to introduce
it as a topic.
00:07
We’re going to cover the major functions
of the gastrointestinal system.
00:11
After this lecture, we will also be
able to explain the phases of digestion
of which there are
three primary phases.
00:19
Furthermore, we’ll be able
to identify and explain
the function of GI signalling molecules
and there are three primary types
that includes the neurocrines, paracrines,
and finally and maybe most
importantly, the GI hormones.
00:33
To be able to talk about the functions
of the gastrointestinal system,
let’s spend a few minutes
discussing these.
00:41
So first and foremost, the most important
function of the GI system is absorption.
00:46
So what this does is takes food stuff
and micronutrients and macronutrients
from the lumen of the GI
system into the body.
00:56
And that’s the important function
of the gastrointestinal system.
01:00
However, to do this, a number of other
functions are necessary including digestion
because when you eat food, you eat
food in complex types of processes.
01:12
These complex molecules will be
broken down into smaller molecules
so they can be transported
into the body.
01:20
Finally, there are some portions
of food that you don’t utilize.
01:24
And for those, you need to
excrete it out of the body.
01:28
To move them along the whole path
of the gastrointestinal system,
you need to have a coordinated
motility system in place.
01:37
Finally, some ports of the gastrointestinal
system’s main job is to store things.
01:42
Because you need to deliver
the particular food
stuff to the right place
at the right time.
01:48
And sometimes you need to hold
it for a certain period of time
before you open one of the
sphincters to let it go through.
01:55
And finally, to undergo digestion,
the body is going to have to put in
a number of substances into the intestinal
lumen to be able to undergo digestion.
02:06
So our sixth primary functions
are absorption, digestion,
excretion, motility,
storage, and secretion.