Excretory System - Free Printable
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Step-by-step solution for: Excretory System
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Show Answer Key & Explanations
Step-by-step solution for: Excretory System
Let's go through each question one by one and determine the correct answer with a brief explanation.
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1. Which of the following is the fluid released by the kidneys once the wastes are removed from the water and blood in the body?
- Bile – Produced by the liver, not the kidneys.
- Urea – A waste product found in urine, but it's not a fluid.
- Sweat – Released by sweat glands, not the kidneys.
- Urine – ✔ Correct! Urine is the fluid produced by the kidneys after filtering waste from blood and water.
✔ Answer: Urine
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2. Which of the following organs is responsible for removing waste from the blood?
- Kidneys – ✔ Yes! The kidneys filter blood to remove waste products like urea and excess ions.
- Lungs – Remove carbon dioxide (a waste gas), but not general blood waste.
- Liver – Processes toxins and produces bile, but doesn't directly filter blood waste like kidneys do.
- Skin – Removes small amounts via sweat, but not primary.
✔ Answer: Kidneys
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3. When a person breathes out, or exhales, which of the following is released from the body?
- Carbon dioxide and sweat – Sweat is not exhaled.
- Urea and bile – These are not gases; not exhaled.
- Bile and water – Bile isn’t exhaled.
- Water and carbon dioxide – ✔ During exhalation, we release carbon dioxide (CO₂) and water vapor.
✔ Answer: Water and carbon dioxide
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4. Which of the following parts of the urinary system is the tube allowing urine to pass outside the body?
- Ureters – Carry urine from kidneys to bladder.
- Urethra – ✔ Carries urine from the bladder to outside the body.
- Urea – A waste product, not a part of the system.
- Urinary bladder – Stores urine, but does not expel it.
✔ Answer: Urethra
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5. Which of the following organs of the excretory system break down the chemicals, poisons, and other toxins in the body?
- Skin – Eliminates some waste via sweat, but not breakdown.
- Kidneys – Filter blood but don’t break down toxins.
- Liver – ✔ The liver detoxifies harmful substances, breaks down drugs, alcohol, and poisons.
- Lungs – Remove CO₂, not chemical toxins.
✔ Answer: Liver
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6. Which of the following best describes the role of the kidneys when a person starts to become dehydrated?
- The kidneys produce more water for the body. – Incorrect. They can't create water.
- The kidneys absorb more water leading to less urine. – ✔ Yes! In dehydration, antidiuretic hormone (ADH) signals kidneys to reabsorb more water, reducing urine output to conserve water.
- The kidneys begin to stop processing the water in the body, leading to more urine. – No, opposite happens.
- The kidneys release more water – No, they conserve water.
✔ Answer: The kidneys absorb more water leading to less urine.
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7. Which of the following is produced by the liver to break down fats into useful fats or waste?
- Urea – Produced by the liver from amino acids, not fat breakdown.
- Bile – ✔ The liver produces bile, which helps emulsify fats in the small intestine.
- Sweat – Not related to fat breakdown.
- Urine – Not produced by liver for fat breakdown.
✔ Answer: Bile
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8. Which of the following is the largest organ of the body?
- Kidney – Small, paired organs.
- Lungs – Large, but not the largest.
- Skin – ✔ The skin is the largest organ by surface area and weight.
- Liver – Very large, but still smaller than the skin overall.
✔ Answer: Skin
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1. Urine
2. Kidneys
3. Water and carbon dioxide
4. Urethra
5. Liver
6. The kidneys absorb more water leading to less urine.
7. Bile
8. Skin
Let me know if you'd like this formatted as a worksheet answer key!
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1. Which of the following is the fluid released by the kidneys once the wastes are removed from the water and blood in the body?
- Bile – Produced by the liver, not the kidneys.
- Urea – A waste product found in urine, but it's not a fluid.
- Sweat – Released by sweat glands, not the kidneys.
- Urine – ✔ Correct! Urine is the fluid produced by the kidneys after filtering waste from blood and water.
✔ Answer: Urine
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2. Which of the following organs is responsible for removing waste from the blood?
- Kidneys – ✔ Yes! The kidneys filter blood to remove waste products like urea and excess ions.
- Lungs – Remove carbon dioxide (a waste gas), but not general blood waste.
- Liver – Processes toxins and produces bile, but doesn't directly filter blood waste like kidneys do.
- Skin – Removes small amounts via sweat, but not primary.
✔ Answer: Kidneys
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3. When a person breathes out, or exhales, which of the following is released from the body?
- Carbon dioxide and sweat – Sweat is not exhaled.
- Urea and bile – These are not gases; not exhaled.
- Bile and water – Bile isn’t exhaled.
- Water and carbon dioxide – ✔ During exhalation, we release carbon dioxide (CO₂) and water vapor.
✔ Answer: Water and carbon dioxide
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4. Which of the following parts of the urinary system is the tube allowing urine to pass outside the body?
- Ureters – Carry urine from kidneys to bladder.
- Urethra – ✔ Carries urine from the bladder to outside the body.
- Urea – A waste product, not a part of the system.
- Urinary bladder – Stores urine, but does not expel it.
✔ Answer: Urethra
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5. Which of the following organs of the excretory system break down the chemicals, poisons, and other toxins in the body?
- Skin – Eliminates some waste via sweat, but not breakdown.
- Kidneys – Filter blood but don’t break down toxins.
- Liver – ✔ The liver detoxifies harmful substances, breaks down drugs, alcohol, and poisons.
- Lungs – Remove CO₂, not chemical toxins.
✔ Answer: Liver
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6. Which of the following best describes the role of the kidneys when a person starts to become dehydrated?
- The kidneys produce more water for the body. – Incorrect. They can't create water.
- The kidneys absorb more water leading to less urine. – ✔ Yes! In dehydration, antidiuretic hormone (ADH) signals kidneys to reabsorb more water, reducing urine output to conserve water.
- The kidneys begin to stop processing the water in the body, leading to more urine. – No, opposite happens.
- The kidneys release more water – No, they conserve water.
✔ Answer: The kidneys absorb more water leading to less urine.
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7. Which of the following is produced by the liver to break down fats into useful fats or waste?
- Urea – Produced by the liver from amino acids, not fat breakdown.
- Bile – ✔ The liver produces bile, which helps emulsify fats in the small intestine.
- Sweat – Not related to fat breakdown.
- Urine – Not produced by liver for fat breakdown.
✔ Answer: Bile
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8. Which of the following is the largest organ of the body?
- Kidney – Small, paired organs.
- Lungs – Large, but not the largest.
- Skin – ✔ The skin is the largest organ by surface area and weight.
- Liver – Very large, but still smaller than the skin overall.
✔ Answer: Skin
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✔ Final Answers:
1. Urine
2. Kidneys
3. Water and carbon dioxide
4. Urethra
5. Liver
6. The kidneys absorb more water leading to less urine.
7. Bile
8. Skin
Let me know if you'd like this formatted as a worksheet answer key!
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