2. Can anyone remember what to excrete means?
The Excretory System
Can anyone remember what to excrete means?

3. Can anyone remember what to excrete means? TO GET RID OF!
The Excretory System
Can anyone remember what to excrete means? TO GET RID OF!

4. Urine Videos (Les Stroud)
The Excretory System
Urine Videos (Les Stroud)

5. Excretory (=To get rid of!) System
Why do our bodies need to filter waste from the body?
Removal of harmful materials (WASTE)
Maintain homeostasis (= BALANCE!)
Regulates the amount of water and salts
Removal of excess fluids, chemicals, minerals, vitamins, salts, and other wastes from the blood

6. Excretory (=To get rid of!) System
We learned from the DIGESTIVE SYSTEM that:
The SOLID waste is removed by:
*the large intestines/rectum/anus.
We will learn that GASEOUS waste like CO2 and water vapor is removed by the
*Respiratory System (LUNGS).

7. Excretory (=To get rid of!) System
And the LIQUID waste like urea (liquid wastes in blood) is removed by: urinary system
LIQUID waste is also removed in the form of sweat by the:
*Integumentary System (skin).

8. UREA & YOUR KIDNEYS
UREA is a chemical waste product that comes from your cells and the breakdown of proteins.
Your kidneys, which are the major organs of the excretory system, eliminate urea, excess water and salts, and other waste materials.

9. KIDNEYS & NEPHRONS
Your kidneys contain about a million tiny filtering factories called nephrons which act as blood filters to do this:
*Remove waste from the blood & produce urine.

10. NEPHRONS = BLOOD FILTERS
The liver also acts as a filter for the blood, recycling the blood back into the body. It helps to cleans out toxic waste and acid in the blood.
After filtering, the kidneys produce urine, which flows through narrow tubes called ureters, to the urinary bladder (muscular organ), where it is held until expelled through a small tube called a urethra out of the body.
KIDNEY NEPHRONS Produce URINE
(8% sterile waste fluid, 92% water)

11. YOUR (URINARY) BLADDER
The urinary bladder usually holds 400–620 ml (1¾– 2 ½ cups) of urine.
The desire to urinate usually starts when the bladder reaches around 75% of its working volume.
If the person is distracted, the need can fade and return with more urgency as the bladder continues to fill.
If the amount of urine reaches 100% of the urinary bladder volume, the voluntary muscle that controls the bladder, becomes involuntary and the urine will be instantly released.

12. Excretory System Problems
Urinary tract infection- caused by bacteria
It is an infection that affects any part of the urinary tract. The main cause is bacteria called Escherichia coli. Although urine contains a variety of fluids, salts, and waste products, it does not usually have bacteria in it. But when bacteria get into the bladder or kidney and multiply they may cause an infection.
You may suffer repeated bouts of urinary tract infection. Half of all women suffer a urinary tract infection during their lifetime. Many guys suffer from them as well. And a third of those will present a recurrence within 3 or 4 months of the initial episode.

13. Excretory System Problems
Blockage/kidney stones- tiny crystals or “stones” of calcium and minerals form
Kidney stones can form when urine contains too much of certain substances. These substances can create small crystals that become stones.
The biggest risk factor for kidney stones is dehydration.
Kidney stones may not produce symptoms until they begin to move down the tubes (ureters) through which urine empties into the bladder. When this happens, the stones can block the flow of urine out of the kidneys. This causes swelling of the kidney or kidneys, causing pain. The pain is usually severe.

14. Excretory System Problems
Kidney Disease/failure- requiring transplant or dialysis
Some people, however, may have failed or damaged kidneys which cannot carry out the function properly - they may need dialysis. In other words, dialysis is the artificial replacement for lost kidney function.
Approximately 1,500 liters of blood are filtered by a healthy person's kidneys each day. We could not live if waste products were not removed from our kidneys. People whose kidneys either do not work properly or not at all experience a buildup of waste in their blood. Without dialysis the amount of waste products in the blood would increase and eventually reach levels that would cause coma and death.

15. Excretory System Review
What is the function of the Excretory System?

16. Excretory System Review
Excretory system: is responsible for the removal of wastes produced by the body while it maintains homeostasis.
It also maintains homeostasis by regulating how much water is in the body.

17. Excretory System Review
The SOLID waste is removed by:___________
The GASEOUS waste like CO2 and water vapor is removed by the: _______
And the LIQUID waste like urea is removed by: _____ & waste is removed in the form of sweat by the _____.

18. Excretory System Review
The SOLID waste is removed by:_____large intestines/rectum______
The GASEOUS waste like CO2 and water vapor is removed by the: ___lungs____
And the LIQUID waste like urea is removed by: __urinary system___ & waste is removed in the form of sweat by the ___skin__.

19. Excretory System Review
What is the function of the kidneys?

20. Your kidneys, filter your bloodstream, eliminate urea, excess water and salts, and other waste materials.
Your kidneys contain about a million tiny filtering factories called nephrons which act as blood filters to do this:
Remove waste from the blood and produce urine.

21. Where is urine stored until the body is ready to eliminate it?
Kidneys
Ureters
Bladder
Urethra

22. Which is not a function of the excretory system?
Removes wastes from the blood
Removes excess water from the blood
Removes carbon dioxide from the blood
Removes excess salt from the blood

23. Which system does not include an excretory organ?
Excretory system
Integumentary system
Cardiovascular system
Respiratory system

24. (PART OF DIGESTIVE SYSTEM)
Excretory system Function:
1. responsible for the ____________________________________________while it maintains homeostasis. It also maintains homeostasis by regulating how much ____________________ is in the body.
The SOLID waste is removed by:_____________________
The GASEOUS waste like CO2 and water vapor is removed by the: ___________
And the LIQUID waste like urea is removed by: _____________ & waste is removed in the form of sweat by the __________.
The FILTERING process:
__________________ is a chemical waste product that comes from your cells and the breakdown of proteins.
Your kidneys ,which are the major organs of the excretory system, eliminate urea, excess water and salts, and other waste materials.
Your kidneys contain about a million tiny filtering factories called
______________ which act as blood filters to do this:
_________________________________________________________________.
The liver also acts as a filter for the blood, recycling the blood back into the body. . It helps to cleans out toxic waste and acid in the blood.
After filtering, the kidneys produce urine, which flows through narrow tubes called _______________________, to the ____________________, where it is held until expelled through a small tube called a ____________ out of the body.
The urinary bladder usually holds 400–620 ml (1¾– 2 ½ cups) of urine. The desire to urinate usually starts when the bladder reaches around 75% of its working volume. If the person is distracted, the need can fade and return with more urgency as the bladder continues to fill. If the amount of urine reaches 100% of the urinary bladder volume, the voluntary muscle that controls the bladder, becomes involuntary and the urine will be instantly released.
Rectum
(Behind Urethra)
(PART OF DIGESTIVE SYSTEM)
Problems:

25. (PART OF DIGESTIVE SYSTEM)
Excretory system: is responsible for the removal of _wastes___ produced by the body while it maintains homeostasis. It also maintains homeostasis by regulating how much _______water & salt________ is in the body.
The SOLID waste is removed by:_____large intestines/rectum______
The GASEOUS waste like CO2 and water vapor is removed by the: ___lungs____
And the LIQUID waste like urea is removed by: __urinary system___ & waste is removed in the form of sweat by the ___skin__.
The FILTERING process:
____urea_____ is a chemical waste product that comes from your cells and the breakdown of proteins.
Your kidneys, which are the major organs of the excretory system, eliminate urea, excess water and salts, and other waste materials.
Your kidneys contain about a million tiny filtering factories called
__nephrons______ which act as blood filters to do this:
______Remove waste from the blood and produce urine____________________.
The liver also acts as a filter for the blood, recycling the blood back into the body. . It helps to cleans out toxic waste and acid in the blood.
After filtering, the kidneys produce urine, which flows through narrow tubes called ____ureters______, to the _____urinary bladder______, where it is held until expelled through a small tube called a __urethra___out of the body.
The urinary bladder usually holds 400–620 ml (1¾– 2 ½ cups) of urine. The desire to urinate usually starts when the bladder reaches around 75% of its working volume. If the person is distracted, the need can fade and return with more urgency as the bladder continues to fill. If the amount of urine reaches 100% of the urinary bladder volume, the voluntary muscle that controls the bladder, becomes involuntary and the urine will be instantly released.
Kidneys
(Blood filters)
Ureters
(Narrow tubes)
Urinary
Bladder
Rectum
(Behind Urethra)
(PART OF DIGESTIVE SYSTEM)
Urethra
Problems: