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Understanding the Physiology of Health and Illness

The urinary system and the kidney nephron

  • 3 things to know
  • AS 7

Overview

Two main roles of the urinary system, main organs of the urinary system and difference between a ureter and the urethra.

What you need to know

Answer each one before you reveal it.

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Key term

State the two main roles of the urinary system.

Key term

Define excretion.

Key term

Name the main organs of the urinary system.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    State the two main roles of the urinary system.

    Model answer

    The urinary system carries out excretion, removing metabolic waste from the blood, and osmoregulation, controlling the body's water and salt content.

  2. 2

    Define excretion.

    Model answer

    Excretion is the removal from the body of the waste products of metabolism.

  3. 3

    Name the main organs of the urinary system.

    Model answer

    The urinary system is made up of two kidneys, two ureters, the bladder and the urethra.

  4. 4

    What is the difference between a ureter and the urethra?

    Model answer

    A ureter carries urine from a kidney down to the bladder, while the urethra carries urine from the bladder out of the body.

  5. 5

    Which waste product of protein breakdown do the kidneys remove?

    Model answer

    The kidneys remove urea, the waste the liver makes when it breaks down surplus amino acids.

  6. 6

    What is a nephron?

    Model answer

    A nephron is the microscopic filtering unit of the kidney, and each kidney holds around a million of them.

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