Edexcel IGCSE Biology

Revision Notes

2.9.3 The Urinary System

The Urinary System: Structure

  • Two key functions of the urinary system are:
    • To filter waste products from the blood and expel it from the body as urine
    • To control the water levels of the body (osmoregulation)
  • The urinary system consists of two kidneys (found at the back of the abdomen) joined to the bladder by two tubes called the ureters
  • Another tube, the urethra, carries urine from the bladder to outside the body
  • Each kidney is also connected to:
    • The renal artery which comes from the aorta and delivers oxygenated blood to the kidney
    • The renal vein which delivers the deoxygenated blood from the kidney to the vena cava

The urinary system in humans, IGCSE & GCSE Chemistry revision notes

The urinary system in humans

Main Structures of the Urinary System Table

The Urinary System table, IGCSE & GCSE Biology revision notes

Exam Tip

Note the difference between the ‘ureter’ and the ‘urethra’.

These two names are commonly confused by students so take care to learn them and know which tube is which – they are NOT interchangeable!

Author: Ruth

Ruth graduated from Sheffield University with a degree in Biology and went on to teach Science in London whilst also completing an MA in innovation in Education. With 10 years of teaching experience across the 3 key science disciplines, Ruth decided to set up a tutoring business to support students in her local area. Ruth has worked with several exam boards and loves to use her experience to produce educational materials which make the mark schemes accessible to all students.

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