Page 21 - E-Science Prim.6 2024-2025 U1 Con.2,3_Handy

Urinary System

Function: It removes waste products from the blood in the form of urine.
Structure:

Large artery carries the blood
to the two kidneys with wastes

1- The two Kidneys 2- The two ureters

They continuously clean and filter Urine has urea, other Two narrow tubes
the blood up to 300 times a day. wastes and water. emerge from the two
It has ultrastructure “nephrons” kidneys and open at the

that filter the blood and removes bladder.

the wastes through tiny blood They pass the urine to
the bladder.
vessels pass through it.
The most important waste removed

by kidneys is urea “from

breaking proteins”

Blood cells & proteins
can’t be filter through
nephrons as they are

too large.

4- Urethra 3- The Bladder

It is a duct which extends It receives the urine from
from the urinary bladder ureters and stores it
and opens outside the body. temporarily until it is

It allows urine to pass released outside through
outside the body. urethra.

Urination is expelling the 33
urine outside the body.

First Term