Excretion Process and Urea
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Questions and Answers

What is the primary function of the kidneys?

  • To carry urine to the bladder
  • To filter blood and remove urea (correct)
  • To store urine
  • To transport blood away from the kidneys
  • The ureters are responsible for storing urine temporarily.

    False

    What solution is formed when urea dissolves in excess water?

    urine

    The structural and functional unit of the kidney is called the ______.

    <p>nephron</p> Signup and view all the answers

    Which part of the excretory system carries urine from the bladder to the outside world?

    <p>Urethra</p> Signup and view all the answers

    Match the components of the excretory system with their functions:

    <p>Veins = Take blood away from the kidneys Arteries = Bring blood to the kidneys Ureters = Carry urine from the kidneys to the bladder Bladder = Stores urine temporarily</p> Signup and view all the answers

    The kidneys absorb 75% of the blood that reaches them.

    <p>False</p> Signup and view all the answers

    What does the nephron do in the kidneys?

    <p>Performs filtration and absorption</p> Signup and view all the answers

    What is the primary function of excretion in living organisms?

    <p>To eliminate waste materials</p> Signup and view all the answers

    Urea is a safe substance that the body can hold in high amounts without causing harm.

    <p>False</p> Signup and view all the answers

    What organ converts smaller molecules from protein breakdown into urea?

    <p>liver</p> Signup and view all the answers

    Urea is transported from the liver to the kidneys via the ______.

    <p>bloodstream</p> Signup and view all the answers

    Match the following terms with their respective functions:

    <p>Urea = A harmful waste product Kidneys = Organs that eliminate waste Liver = Converts excess proteins to urea Renal system = Related to kidneys</p> Signup and view all the answers

    Study Notes

    Excretion

    • Excretion is the process of removing waste materials from the body.
    • It is a characteristic of all living things.
    • Excretion does not mean getting rid of all waste materials only waste materials truly inside the body.
    • This happens even for only a short while.
    • Waste travels through the body from the mouth to the anus in the digestive system, but this doesn't count as excretion

    What Excretion Includes?

    • Excretion includes all waste substances that cells create (ex. CO2)
    • The body produces more waste than needed so removal is necessary.
    • Getting rid of feces is not excretion.

    Urea

    • Urea is a waste substance made in liver cells.
    • Protein is broken down into smaller molecules, these molecules are transported into bloodstream & to the liver.
    • The liver changes these molecules into urea.
    • Urea is poisonous if it builds up.
    • The urea is removed from the blood by the kidneys.
    • This kidney system is also known as the renal system.

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    Description

    This quiz covers the basics of excretion, including the definition and processes involved. It highlights the role of urea in the body's waste removal system, specifically focusing on how it is produced and eliminated. Test your knowledge of these essential biological processes!

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