Download Excretory System Period 7 - Mercer Island School District

Excretory System Period 7
By,
Daniel K., Kyle B., Fiona S., Jane M.
What Does This System Do?
The Excretory system is responsible for the elimination of wastes produced by
homeostasis.
There are several parts of the body that are involved in this process, such as
sweat glands, the liver, the lungs and the kidney system.
Each of these organs play a critical role in expelling waste from the
body
Functions of the Excretory System
The lungs, skin, kidneys, and large intestine are all organs in the excretory
system.
The urinary system is made up of the kidneys, the ureters, the bladder, and the
urethra.
The filtering parts of the kidneys are the nephrons.
Water and waste molecules move out of the blood capillaries and into the
nephrons.
Structure of Kidneys
Kidneys have an outer convex side and an inner concave side called the renal
hilus, where the renal artery, vein, and ureter can be located, there is also a thin
connective tissue called the renal capsule surrounds each kidney.
How The System Maintains Homeostasis
The excretory system removes wastes from the body, keeps it cool, and maintains
water balance.
Organs:
Kidneys
Sweat Glands
Liver
Lungs
Skin
What is a Nephron?
A nephron is the basic structure and functional unit of the kidney. Its main
function is to regulate the concentration of water and/or soluble substances
like sodium salts by filtering the blood, reabsorbing what is needed and
discarding the rest as urine.
How It Works With Other Systems
It works with the circulatory system with the blood that passes through one of the
kidneys and toxins in the blood are filtered out by the kidney.
Digestive System: assists in ridding the body of wastes throughout the
digestive tract where the nutrients are removed and the excess waste
is sent to the anus
Respiratory System: assists in the lungs by removing excess Carbon
Dioxide and helping to keep excess water vapors out of the lungs
Disorders and diseases
• Kidney stones: These pass through the urinary tract and may obstruct urine
from exiting body can be painful and may damage the kidneys and/or cause
infections.
• De Toni-Faconi syndrome: De Toni-Faconi syndrome is a metabolic disorder
affecting kidney transport, mostly seen by kidney tubules failures of
reabsorbing water, phosphate, potassium, glucose, amino acids and other
substances.
Kidney Dialysis Treatment
Kidney dialysis treatment is the artificial process of eliminating waste
(diffusion) and unwanted water (ultrafiltration) from the blood.
The kidneys naturally do this, but people who have failed or damaged kidneys
that cannot carry out these functions will need treatment.