1. Chapter 3 – Human Body Systems
Lesson 5 –
The Excretory
System
© Brent Coley |

2. What does the excretory system do?
It gets rid of wastes:
solid waste from digestion (through the large intestine)
carbon dioxide from cells (through the lungs)

3. What does the excretory system do?
It gets rid of wastes:
liquid waste from cells (through the kidneys, which filter wastes out of the blood and then produce urine)
sweat (through the skin)

4. How does your body filter blood?
Blood passes through the kidneys 60 times a day.
The kidneys remove substances the body no longer needs and returns substances it does need.
Nephron – part of the kidney where wastes are separated from useful materials

5. What happens if the kidneys stop working?
Wastes can build up to dangerous levels.
People with this problem need dialysis, a treatment where a machine does the job of the kidneys.

6. How does your body get rid of liquid wastes?
Through the urinary system:
Urine is released from the body.
Through the skin:
Sweat is released through tiny openings in the skin called pores.

7. All images courtesy of Microsoft Office Online.