The Digestive and Excretory Systems
Transcript The Digestive and Excretory Systems
The Digestive and
What do you know
about the digestive
system? List at least
Write 2 questions
about digestive system
that you don’t know
the answer to, but like
to learn about it.
What is Digestion
Digestion is the process which takes food
and breaks it down into small pieces so it
can be absorbed into your bloodstream.
Your Digestive System is a group of organs
that work together to digest foods.
Types of Digestion
There are two types of
• Chemical Digestion-Foods are
broken down with the help of
• Mechanical- Foods are
physically broken down into
Digestion begins in the MOUTH through
both chemical and mechanical digestion.
Mechanical Digestion – Teeth physically
break down food particles into small pieces
Chemical Digestion – Salivary glands secrete
Saliva in the mouth which begins to digest
Food is swallowed and moves into the
ESOPHAGUS where it is pushed into the
The stomach also does both mechanical digestion
and chemical digestion.
Mechanical digestion -The stomach churns the food,
breaking it down into small particles.
Chemical -many chemicals are secreted into the
stomach that break down the food into tiny
The SMALL INTESTINE
is a LONG, coiled tube
(about 20 feet long).
projections called VILLI
cover the walls of the
The villa absorb the
nutrients from the food,
and pass them onto the
• The LIVER produces bile
• GALLBLADDER stores
• Bile is secreted into the
small intestine to help
• The PANCREAS secretes
juices into the small
intestine that help break
The Helper Organs
of the Digestive
Removing Wastes from the
Your Excretory System removes all
waste from your body and controls
The three types of waste produced
by the body are solids, liquids and
The digestive system is responsible
for producing liquid and solid wastes.
Some of the foods that
are not completely
absorbed by the body,
like fiber, produce solid
waste which is then
stored in the colon.
After most of the water
is absorbed by the body,
the waste is called
FECES, and is excreted
through the anus.
KIDNEYS filter water and waste
from the blood.
The substance secreted by the
kidneys is called urine, and it is sent
to the bladder.
Urine is excreted from the body
through the URETHRA