Download Chapter 3, Lesson 5 - The Excretory System

Lesson 5 –
The Excretory
System
It gets rid of wastes:
solid waste from digestion
(through the large intestine)
carbon dioxide from cells
(through the lungs)
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)
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
Wastes can build up to
dangerous levels.
People with this problem need
dialysis, a treatment where a
machine does the job of the
kidneys.
Through the urinary system:
Urine is released from the
body.
Through the skin:
Sweat is released through tiny
openings in the skin called
pores.