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Unit 3 - Urine Production
Water leaves the body in sweat, urine and air which is breathed out.

Unit 3 - Urine Production

You may not give much thought to urine - just an inconvenience which causes you to visit the toilet every few hours! But have you ever thought about the production of urine? Urine is made in the kidneys when they filter waste products from the blood, but how exactly do they do it? In this GCSE Biology quiz you'll learn all about the production of urine.

The urinary system is designed to remove certain waste materials from the body, including urea, excess ions and water. These waste materials are eliminated as urine which consists of the ions and urea dissolved in the excess water. The production of urine takes place in the kidneys. Here millions of microscopic filtering units, called nephrons, filter the blood and reabsorb important molecules such as glucose. Water and ions are also reabsorbed as required by the body.

1 .
Water leaves the body in sweat, urine and...
blood
plasma
air we breathe out
food
We lose a significant amount of water as water vapour from our exhaled breath
2 .
If the kidneys fail, urea builds up and is a problem because it is...
toxic
harmless
a gas
infectious
Dialysis filters the blood and removes urea from the patient's blood
3 .
Kidney transplant may be rejected due to...
mismatch of tissue antigens
infection
lack of kidney donors
cost
Donor and recipient tissue antigens are matched as far as possible. Antibodies are often formed which attack the new kidney. This is called tissue rejection
4 .
Urea is made here from excess amino acids.
Liver
Kidneys
Nephrons
Villi
The liver processes many molecules produced by digestion
5 .
All of this important substance is filtered then reabsorbed by the nephron into the blood.
Sucrose
Fructose
Starch
Glucose
Glucose is filtered out of the blood but is then reabsorbed back into the blood again
6 .
Which organs are responsible for filtering the blood?
Kidneys
Liver
Lungs
Brain
The kidneys produce urine which consists of urea and excess ions dissolved in the excess water that has been removed from the blood
7 .
Which of the following is a microscopic filtering unit found in the kidney?
Alveolus
Nephron
Villus
Hair
Nephrons have several sections. You should know their names and jobs for the exam
8 .
Urea leaves the body in the...
blood
faeces
saliva
urine
It is stored in the bladder
9 .
Urine is stored inside which part of the body before being expelled?
Liver
Pancreas
Gall bladder
Bladder
If you are dehydrated, your urine is dark yellow
10 .
Which tube conveys urine to the bladder from the kidney?
Urethra
Ureter
Uterus
Uvula
The nephrons supply urine to these via collection ducts
You can find more about this topic by visiting BBC Bitesize - Homeostasis in humans

Author:  Donna Maria Davidson

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