Download DigestiveSystemPPT

Essential Questions
• What are the major systems of the
human body?
• How does the digestive system help
my body function?
• What are the major organs of the
digestive system?
Let’s Review…
Cellular Organization
• Cells that work together to perform a specific function form a
_______________.
tissue
• Just as cells that work together form a tissue, tissues that work
together form an _______________.
organ
• Organs that work together to perform a function form an
__________________
organ system
• Example: circulatory system.
Look at it This Way…
Organ Systems
Organs
Tissues
Cell (basic unit of life)
The Human Body
• Remember, organs that work together
to do a job in the body are called
organ systems.
• This week we will be looking at some
of the major organ systems starting
with…
DIGESTION!
What’s the Purpose?
The purpose of the Digestive
System is to convert food
particles into simpler molecules
that can be absorbed into the
bloodstream and used by the
body
Think of it This Way…
• The Digestive System breaks food
down into smaller parts that our body
needs for energy, growth, and repair.
Did You Know??
Digestion begins as soon as
you begin to chew your food!
Breaking Down Food
• As you chew your food, food is
broken down into smaller parts.
Glands in your mouth produce saliva.
Saliva breaks down some of the
carbohydrates. Chewing and saliva
break down starchy foods (breads,
pasta, potatoes, etc) into sugars for
the body.
Try This…
• Try eating an unsalted cracker for a
minute or two.
• What do you notice?
The cracker begins to have a sweet taste.
What’s Happening???
Your body is breaking down the starch in the
cracker and turning it into sugar.
Moving on with Digestion
• From the mouth, food travels down
the esophagus, the long tube that
leads to the stomach.
• Your stomach has acid that breaks
down the swallowed food.
More Digestion
• When food leaves your stomach and goes
to your small intestine, it is a thick liquid.
As food moves through the small intestine,
nutrients are absorbed and passed into the
blood.
• Whatever is not absorbed by the small
intestine goes to the large intestine, where
water and vitamins are absorbed.
• The remaining waste leaves your body
when you use the restroom
Other Parts of the
Digestive System
• Pancreas – produces the hormone
insulin that regulates blood sugar
levels. It also helps neutralize stomach
acid
• Liver – produces bile, which breaks
down fats in foods
• Gallbladder – pouch-like organ that
stores bile for future use
The Big Idea!!
Your body needs
nutrients from food
for energy and
proper cell function.
Every human spent about half
an hour
as a single cell.
Every time you lick a
stamp, you're consuming
1/10 of a calorie.
Useless
Human Body
Facts
An average human drinks
about 16,000 gallons of
water in a lifetime.
Let’s Review
• Which of the following is not part of
the digestive system?
• A. femur
The femur is a major
• B. stomach
bone in your body!
• C. liver
• D. salivary glands
Let’s Review
• The digestive process starts in the…
• A. esophagus
• B. mouth
• C. stomach
• D. restroom
Let’s Review
• What does the digestive system do?
• A. breaks down and handles food
• B. pumps blood throughout the body
• C. helps you breathe
• D. helps your arms and legs move
Let’s Review
• What tube moves food from the back
of the throat to the stomach?
• A. pharynx
• B. feeding tube
• C. epiglottis
• D. esophagus
Let’s Review
• Which of the following is
responsible for storing bile?
Bile is needed to break down
the fat that is found in food.
• A. liver
• B. gallbladder
• C. pancreas
• D. stomach
Let’s Review
• Where is the final place for
digestion?
• A. small intestine
• B. stomach
• C. large intestine
• D. pancreas