The Excretory System: Grade 9 Science
Explore the structure and function of the human excretory system, focusing on the kidneys, nephrons, and the process of urine formation.
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The Excretory System
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Read each question carefully and provide your best answer. For multiple choice questions, circle the correct option. For fill-in-the-blanks, complete the sentence with the appropriate term. Show your work for short answer questions.
1. Which of the following is NOT a primary organ of the excretory system?
Kidneys
Lungs
Skin
Liver
2. The functional unit of the kidney responsible for filtering blood is called the:
Ureter
Nephron
Bladder
Urethra
3. The two main processes involved in urine formation are glomerular filtration and tubular .
4. The transport urine from the kidneys to the urinary bladder.
5. Excess water, salts, and urea are removed from the body by the system.
6. Label the indicated parts of the kidney cross-section:
A:
B:
C:
7. Briefly explain the role of the excretory system in maintaining homeostasis.
8. The liver is not considered part of the excretory system because it does not produce urine.
True
False
9. Reabsorption occurs primarily in the Bowman's capsule.
True
False