Revise the Process of Urine Production

Biology Quiz - Unit 3 - Urine Production (Questions)

GCSE Biology explores how kidneys filter the blood, remove waste like urea and carefully control water levels so the body’s internal environment stays safe and stable.

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Fascinating Fact:

Blood enters the kidney through the renal artery and flows into many tiny filtering units called nephrons. Each nephron produces a small amount of urine.

In GCSE Biology, urine production is studied as part of excretion and homeostasis. You learn how kidneys remove urea and excess water, adjust salt levels and return useful substances to the blood so internal conditions stay balanced.

Key Terms

Kidney: An organ that filters the blood, removes waste products and helps control the body’s water and salt balance.
Nephron: A microscopic tubule inside the kidney where blood is filtered and useful substances can be reabsorbed.
Urea: A waste substance made in the liver from excess amino acids and removed from the body in urine.

Frequently Asked Questions (click to see answers)

What do the kidneys do in GCSE Biology?

In GCSE Biology, kidneys are described as organs that remove urea and other waste from the blood, control water and ion levels and help keep internal conditions stable.

How is urine produced in the kidney?

Urine production involves filtering small molecules out of the blood, reabsorbing useful substances like glucose and most water, then leaving excess water, ions and urea to form urine.

Why is urine production important for homeostasis?

Urine production is important because it removes toxic waste and allows the body to control water and salt levels, which keeps cells working properly and protects organs from damage.

Try These Related Quizzes

Which organs are responsible for filtering the blood?

[ ]	Kidneys
[ ]	Liver
[ ]	Lungs
[ ]	Brain

Urea is made here from excess amino acids.

[ ]	Liver
[ ]	Kidneys
[ ]	Nephrons
[ ]	Villi

Urea leaves the body in the...

[ ]	blood
[ ]	faeces
[ ]	saliva
[ ]	urine

Which of the following is a microscopic filtering unit found in the kidney?

[ ]	Alveolus
[ ]	Nephron
[ ]	Villus
[ ]	Hair

All of this important substance is filtered then reabsorbed by the nephron into the blood.

[ ]	Sucrose
[ ]	Fructose
[ ]	Starch
[ ]	Glucose

Urine is stored inside which part of the body before being expelled?

[ ]	Liver
[ ]	Pancreas
[ ]	Gall bladder
[ ]	Bladder

Which tube conveys urine to the bladder from the kidney?

[ ]	Urethra
[ ]	Ureter
[ ]	Uterus
[ ]	Uvula

If the kidneys fail, urea builds up and is a problem because it is...

[ ]	toxic
[ ]	harmless
[ ]	a gas
[ ]	infectious

Water leaves the body in sweat, urine and...

[ ]	blood
[ ]	plasma
[ ]	air we breathe out
[ ]	food

10.

Kidney transplant may be rejected due to...

[ ]	mismatch of tissue antigens
[ ]	infection
[ ]	lack of kidney donors
[ ]	cost

Biology Quiz - Unit 3 - Urine Production (Answers)

Which organs are responsible for filtering the blood?

[x]	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

Urea is made here from excess amino acids.

[x]	Liver
[ ]	Kidneys
[ ]	Nephrons
[ ]	Villi

The liver processes many molecules produced by digestion

Urea leaves the body in the...

[ ]	blood
[ ]	faeces
[ ]	saliva
[x]	urine

It is stored in the bladder

Which of the following is a microscopic filtering unit found in the kidney?

[ ]	Alveolus
[x]	Nephron
[ ]	Villus
[ ]	Hair

Nephrons have several sections. You should know their names and jobs for the exam

All of this important substance is filtered then reabsorbed by the nephron into the blood.

[ ]	Sucrose
[ ]	Fructose
[ ]	Starch
[x]	Glucose

Glucose is filtered out of the blood but is then reabsorbed back into the blood again

Urine is stored inside which part of the body before being expelled?

[ ]	Liver
[ ]	Pancreas
[ ]	Gall bladder
[x]	Bladder

If you are dehydrated, your urine is dark yellow

Which tube conveys urine to the bladder from the kidney?

[ ]	Urethra
[x]	Ureter
[ ]	Uterus
[ ]	Uvula

The nephrons supply urine to these via collection ducts

If the kidneys fail, urea builds up and is a problem because it is...

[x]	toxic
[ ]	harmless
[ ]	a gas
[ ]	infectious

Dialysis filters the blood and removes urea from the patient's blood