The excretory system works to maintain balance in the body by filtering waste and toxins from the blood and eliminating them from the body. It is led by the kidneys, which filter waste through tiny nephrons. The kidneys then produce urine, which travels through ureters to the bladder for storage and is later released through the urethra. In addition to the kidneys, the large intestine, liver, skin, and lungs all play roles in excretion to eliminate various waste products.

1. Excretory System

2. Excretory System
Excretory System:
• The excretory is a waste filtering and disposal
system.
• The body needs to maintain a balance in the
concentration of water, salts and nutrients. The
excretory system helps ensure no chemicals
present in unhealthy amounts.
• It also makes sure the body retains enough
water to continue all its functions.
The main organ of the excretory system is the
kidneys.

3. Excretory System

4. Main Parts of Excretory System
Kidneys
Your body has 2 kidneys.They filter toxins from blood
and generate urine.
Ureters
Each kidney is connected to the bladder by 2 narrow
ducts.These bring urine to the bladder.
Bladder
The bladder stores urine.When it fills up, a signal is sent
to the brain to indicate the need to urinate.
Urethra
The urethra is a narrow duct that passes through the
genitalia to drain urine from the body during urination.

5. Kidneys
Nephrons: tiny filtering units
called nephrons.
There are MANY of them.They
use a complex system to filter
out toxins like urea from the
blood and generates urine.
Urea is one of the main waste
products that come from
cellular processes in the body.

6. Other Parts of Excretory System
Although the kidneys are considered to be
the main organ of the excretory system,
other organs play roles in excretion.
The large intestine eliminates solid wastes
that remain after the digestion of food.
The liver breaks down excess amino acids
and toxins in the blood.
The skin eliminates excess water and salts
in sweat.
The lungs exhale water vapor and carbon
dioxide.