Transcript Slide 1 - Skyline School

7. The Excretory System
1
Once food leaves the
small intestine, most of
its usable parts have
been removed
Only waste products and extra water
are left
2
Now it is time for the excretory system
to go to work
Vocabulary:
Excretory system
A body system that removes wastes
from the body
3
The undigested food moves from the
small intestine into the large intestine
Some water is removed for use by the
body
4
The solid waste is pushed through the
large intestine by muscles
In the large intestine, tiny organisms
called bacteria begin to feed on the
waste
5
Vocabulary:
bacteria
One-celled living things that help
break down waste in the large
intestines
6
Finally, the waste reaches the end of the
large intestine
It passes through the last part of the
digestive system
7
This is known as the rectum
Vocabulary:
rectum
The last part of the large intestine
8
Muscles in the rectum push waste out
of the body through the anus
Vocabulary:
anus
Opening in the body that allows solid
waste to pass out of the body
9
Remember that your body needs to get
rid of undigested food
The excretory system removes this
solid waste from the body
10
But the body also needs a way to get rid
of harmful chemicals
It also has to remove extra water
11
This liquid waste is also removed by
the excretory system
The main organ of the excretory
system are the kidneys
12
Vocabulary:
kidneys
An organ that filters out water, salts,
and chemicals
13
The kidneys are two bean-shaped
organs about the size of your fist
The kidneys act as filters
14
As blood passes through the kidneys,
they filter out water, salts, and harmful
chemicals
Urine is then produced by the kidneys
15
Vocabulary:
urine
Liquid that is produced by the
kidneys
16
Urine moves from the kidneys to the
bladder
Vocabulary:
bladder
An organ that holds urine
17
When your bladder is full, you feel the
need to empty it
Then urine passes from your bladder
out of the body through the urethra
18
Vocabulary:
urethra
The body opening that allows urine to
pass from the body
19