Transcript Excretory System

The Excretory System
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
The Excretory System
Kidney
Ureter
Urinary Bladder
Urethra
The Excretory System
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
1.Kidneys
Function/involvement in excretory system
Each kidney contains about 1 million nephrons, which filter the
blood and eliminate urea, excess water, and other wastes.
The Excretory System
The kidneys are "bean-shaped" organs measuring approx. 10
cm long and 5.5 cm in width. The kidneys account for only 0.4%
of body weight, however, they can filter 180 liters of blood each
day.
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
Function / involvement in excretory system
1. Kidneys
Each kidney contains about 1 million nephrons, which filter the
blood and eliminate urea, excess water, and other wastes.
2. Ureters
25-30 cm long tubes that transport urine from the kidneys to the
urinary bladder.
The Excretory System
Urine travels from each kidney
through the ureters to the
urinary bladder.
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
Function / involvement in excretory system
1. Kidneys
Each contain about 1 million nephrons, which filter the blood
and eliminate urea, excess water, and other wastes from the body
2. Ureters
25-30 cm long tubes that transport urine from the kidneys to the
urinary bladder
3. Urinary
bladder
A sacklike muscular organ that stores urine.
The Excretory System
When the bladder is full, its walls
stretch and you feel the need
to urinate.
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
Function / involvement in excretory system
1. Kidneys
Each contain about 1 million nephrons, which filter the blood
and eliminate urea, excess water, and other wastes from the body
2. Ureters
25-30 cm long tubes that transport urine from the kidneys to the
urinary bladder
3. Urinary
bladder
A sacklike muscular organ that stores urine.
4. Urethra
A small tube through which urine leaves the body from the
urinary bladder.
The Excretory System
The Excretory System
The filtering process
Each kidney contains about 1 million nephrons, which filter
all of the blood in an adult’s body 20 to 25 times each day!
The Excretory System
The filtering process
Nephrons remove waste from the blood and produce urine..
Urine formation is a multi-stage process
1. Blood from an artery
enters the nephrons inside
the kidneys
The Excretory System
The filtering process
Nephrons remove waste from the blood and produce urine..
Urine formation is a multi-stage process
2. The blood reaches a cluster
of capillaries where urea,
water, glucose, and other
substances are removed and
enter a long twisting tube.
The Excretory System
The filtering process
Nephrons remove waste from the blood and produce urine..
Urine formation is a multi-stage process
3. As the materials taken
from the blood flow
through the tube, needed
materials such as glucose
and water are reabsorbed
into the bloodstream.
The Excretory System
The filtering process
Nephrons remove waste from the blood and produce urine..
Urine formation is a multi-stage process
4. The remaining wastes (urea,
other chemicals, and some of
the water) remain in the tube
and are packaged into urine.
The urine is sent out of the
kidneys, through the ureters
and into the bladder.
“Mrs. Harris or Mr. Adkins, can I please go to the
bathroom now ?!?”
The Excretory System
Remember what homeostasis means??
The kidneys play an important role in maintaining homeostasis
by regulating how water is put back into the blood inside the
nephrons, and how much is removed from the body in the urine.
If you’re playing soccer
on a hot day and you
haven’t drank much
water, how will your
kidneys react to
maintain homeostasis??
The Excretory System
Your need to drink at least 2 liters
every day for your kidneys to
maintain the proper water balance
in your body!!
Eating fruits and vegetables that
contain lots of water can help.
The Excretory System
What if your kidneys stopped
functioning??
What possible problems
could this cause in your
body??
A dialysis
machine is
designed
to filter the blood
just like your
kidneys do.
The Excretory System
The Excretory System
Other Organs of Excretion
A little bit of review…
Why are the lungs
considered part of
the excretory
system?
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
5. The
Lungs
Function / involvement in excretory system
Carbon dioxide and water vapor are excreted through
the alveoli and leave the body as you exhale.
The Excretory System
The Excretory System
Other Organs of Excretion
A little bit of review…
What role does
the skin play in the
excretory system?
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
Function / involvement in excretory system
5. The
Lungs
Carbon dioxide and water vapor are excreted
through the alveoli and leave the body as you exhale.
6. The
Skin
Through the production/formation of perspiration
(sweat), the skin gets rid of excess water, salts and
urea through the pores.
The Excretory System
The Excretory System
Other Organs of Excretion
Many wastes need to be
broken down before they
can be excreted. The liver
breaks down proteins to
produce urea, which is
then transported to the
kidneys.
The Excretory System
The Excretory System: A system in the body that collects wastes
produced by cells and removes the wastes from the body.
Organ
Function / involvement in excretory system
5. The
Lungs
Carbon dioxide and water vapor are excreted
through the alveoli and leave the body as you exhale.
6. The
Skin
Through the production/formation of perspiration
(sweat), the skin gets rid of excess water, salts and
urea through the pores.
7. The
Liver
Produces urea, a waste product that comes from the
breakdown of protein, and sends it to the kidneys.
The Excretory System
The Excretory System
Can you explain how each of these organs play
a role in the excretory system?
Kidneys
Lungs
Skin
Liver
The Excretory System