Transcript Digestive System

Digestive System
By: Cameron Farrell, Alex Phan,
Thao Cao
Introduction
• The Digestive system’s purpose is to, of
course, digest food and water. It’s the
conversion of food/water into stuff for the
body to use. Though the digestive system is
not as easy as it sounds there are many
parts/organs that make up this system.
There are many steps that the digestive
system follows each time a human eats
something.
Parts & Organs
•
•
•
•
•
•
•
•
•
•
•
•
Mouth
Stomach
Esophagus
Liver
Small intestine
Pancreas
Large intestine
Gall bladder
Rectum
Enzymes
Teeth
Anus
How The System Works
• First the teeth in your mouth grinds up the food you
eat. Then the salivary glands in your mouth releases
saliva to soften the food. This process of grinding
down food is called mechanical digestion. The food
then travels down the esophagus. The walls of the
esophagus move the food down in a wave-like motion.
At the bottom of the esophagus is a lower esophageal
sphincter that lets food into the stomach. The pancreas
then releases enzymes into the stomach. The release of
enzymes starts the process of chemical digestion. The
enzymes are juices/acids that break down the food.
How The System Works
• Once the food is inside the stomach, digestive
juices get to work. The digestive juices break
down carbohydrates and proteins and sometimes
it can kill bad bacteria. What is left is called
chyme. This mixture then travels into the small
intestine. The small intestine is the main part of
digestion because it absorbs nutrients. The
nutrients are absorbed by little bristle like things
called villi. The small intestine is about 20 to
maybe 30 feet long.
How The System Works
• Other important parts of the digestive system
includes the liver, gallbladder, and the pancreas.
The liver may not seem very important but it is
because the liver produces cholesterol and blood
proteins. The liver also gets rid of any toxic
materials that could harm your body; like alcohol,
drugs, and poisons. The gallbladder is a small
storage sac that stores bile from the liver. The
pancreas isn’t that big but it is important to
digesting because it produces enzymes to digest
fats and proteins.
How The System Works
• The next to last step is for the food to travel
through the large intestine. The large intestine is
about 4 to 5 feet long.The large intestine has
certain bacteria that produce special nutrients like
vitamin K. The bacteria also has bacteria that
helps boost immunity function and protects
against any harmful bacteria that harms the body.
There’s a part of the large intestine called the
colon; the colon is the part where all the water is
absorbed and the important minerals goes into the
blood to use.
How The System Works
• The very last step for the digestive system is to get
rid of the unnecessary waste. Since all of the water,
important proteins, and nutrients is gone the food is
now hard and no longer mushy. So since the
remains of the food is no longer needed the body
needs to get rid of the waste. So the remains is
collected in the rectum and is then extracted from
the body through the anus. If the waste is not
extracted then the body could get very sick. This is
the process of digesting each time you eat
something.
Interactions With Other
Systems
• The digestive system certainly cannot work alone
it needs help from the other systems. So the
digestive system interacts with two other systems;
the circulatory system and the excretory system.
The circulatory system helps by carrying chemical
signs that help control the speed of digestion. The
excretory system helps by disposing of the
unnecessary waste from the body.
Favorite Website
• http://www.biology4kids.com/files/system
s_main.html
• This is one of the most used websites in our
group because it contains the information
needed. The information is also very
detailed so that it is very easy to understand.
References
• The websites used:
• http://www.healthyme.com/Imagebank/digestive
.swf
• http://www.uen.org/utahlink/tours/tourFrames.c
qi?tourid=13125
• http://www.kidsbiology.com/humanbiology/index
.php
• http://www.ehc.com/vbody.asp