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Excretory System

Human Excretory System: Karina Gonzalez
by

Michelle Brandenburg

on 15 May 2010

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Transcript of Excretory System

Excretory System Interesting Facts!
The Kidney receive the largest amount of blood supply of any organ.
During a single day, all of the blood in the body passes through the kidney about 400 times. The primary function of the excretory system is to:
Get rid of wastes
Eliminates useless by-products excreted from cells
Eradicates harmful chemical build-ups
Maintains a steady, balanced chemical concentration
Kidneys
The kidneys play an important role in maintaning homeostasis. They remove waste products from the blood, and regulate the water content of the blood and blood volume.
What the system does
Urine is produced in the kidneys. The kidneys filter waste from the blood. The urine flows through ureters to the bladder, where it collects. The bladder is emptied periodically. Diseases/disorders: Bladder stones and kidney stones- sometimes, in certain wastes in urin can form crystals that remain and grow inside the kidney or bladder to make "stones". A common remedy in the past was to remove the stones by surgery. Today, doctors use lithotripsy, a meathod that uses ultrasound to disintergrate stones into tiny fragments that can pass out of the body in the urine.

Kidney/Bladder stones cause uncomfort resulting in pain in the abdomen and groins. Parts of the Kidneys Kidneys consist of different parts Renal Vein
This has a large diameter and a thin wall. It carries blood away from the kidney and back to the right hand side of the heart. Blood in the kidney has had all its urea removed. Urea is produced by your liver to get rid of excess amino-acids.
Renal Artery
This blood vessel supplies blood to the kidney from the left hand side of the heart. This blood must contain glucose and oxygen because the kidney has to work hard producing urine. Blood in the renal artery must have sufficient pressure or the kidney will not be able to filter the blood.
Pelvis
This is the region of the kidney where urine collects.
Ureter
The ureter carries the urine down to the bladder. It does this 24 hours per day. Medulla
The medulla is the inside part of the kidney. This is where the amount of salt and water in your urine is controlled. It consists of billions of loops of Henlé. These work very hard pumping sodium ions. The result of this is that very concentrated urine is produced. Cortex
The cortex is the outer part of the kidney. This is where blood is filtered. It only works if the blood entering the kidney in the renal artery is at high pressure.
Bladder
Before being eliminated, urine is temporarily stored in the bladder. This sac made of muscle is spherical in shape when it is full and flat when it is empty. The bladder can hold up to 17 ounces, but the urination reflex appears when the bladder contains between 7 and 14 ounces of urine.
Kidney/ Bladder/ and Uric Acid Stones can be prevented by avoiding foods rich in purine and protein. Meat, which is supposed to contain a huge composition of animal proteins, is a major contributor for the formation of uric acid stones Career
A urologist is a physician who has specialized knowledge and skill regarding problems of the male and female urinary tract and the male reproductive organs.
The median expected salary for a typical Physician-Urology in the United States is $261,779
It takes 6-7 years of education to become a urologist.

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