Transcript Excretory System

Excretory System
‘POISON’ Removal System
Function:
1. Get rid of waste
2. Get rid of useless by-products excreted by cell
3. Get rid of harmful chemical build-up
4. Maintain HOMEOSTASIS
FOUR WASTES
1. Carbon dioxide (lungs)
2. Sweat (skin)
3. Urine (kidneys)
4. Excrement also known as POOP (large
intestines)
(tears, ear wax, snot, gas)
(vomit and pus when sick or have an infection)
Role of Lungs:
Maintain level of carbon dioxide and oxygen in blood
by EXCRETING carbon dioxide
Role of Skin:
1. Sweat helps body temperature stay the same
2. Sweat is excreted through sweat glands
3. Sweat glands contain salt and water (the salt helps
evaporate the water to keep the body cool)
4. Sweat glands located all over body
Role of LIVER:
1. Regulates storage of glycogen, drug detoxification, breaks
down, production of blood plasma components
2. Secretes bile which breaks down fat
3. Bile is a greenish/brownish substance made of water, salts,
cholesterol) which is stored in gall bladder and secreted into
small intestines
4. Changes ammonia from breakdown of amino acids (poisonous
gas) to urea (mix of sugar and waste)
5. Stores glucose, fatty acids, vitamins, and minerals
Role of LARGE INTESTINES:
1. Removes solid waste from body
2. Collects water from waste which is absorbed back into the body
Role of KIDNEYS:
1. Removes liquid waste
2. Blood deposits used and unwanted water,
minerals, and urea (from liver) into kidneys
3. Kidneys filter these wastes to form urine.
Your kidneys produce 1.5 liters of urine a day!
Urinary System Anatomy
Kidney Anatomy
-In each kidney, there are
one million tiny structures
called nephrons.
-The nephron is the basic
unit of the kidney
- function of nephron is to
regulate the concentration
of water and salts by
filtering the blood,
reabsorbing what is
needed, and excreting the
rest as urine.
What is urine?
-yellowish fluid stored in the bladder and
discharged through the urethra
-Made of water, salt, nitrogen compounds
such as urea, and other waste
substances removed from the blood by
the kidneys
Maintaining Homeostasis
• ADH antidiuretic hormone
• Promotes water retention
• More water is reabsorbed into the blood
Concentrated Urine
Dilute Urine