Excretion in Humans Quiz
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5 questions, one answer each
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1. Which organ is responsible for excreting carbon dioxide from the body?
- A. The lungs
- B. The kidneys
- C. The liver
- D. The skin
2. What are the three main substances filtered from the blood into Bowman's capsule at the glomerulus?
- A. Glucose, proteins and red blood cells
- B. Water, glucose, urea and ions
- C. Urea, excess ions and water only
- D. Proteins, urea and glucose
3. Which of the following best explains why the removal of urea from the body is important?
- A. Urea provides energy for muscle contraction
- B. Urea is toxic and would accumulate to harmful levels if not excreted
- C. Urea is needed to regulate body temperature
- D. Urea helps transport oxygen around the body
4. In the nephron, glucose is filtered from the blood at the glomerulus but is not present in the urine. This is because:
- A. Glucose is reabsorbed into the blood in the proximal convoluted tubule
- B. Glucose is broken down by the kidney into simpler molecules
- C. Glucose is too large to be filtered at the glomerulus
- D. Glucose is actively secreted back into the glomerulus
5. The liver converts excess amino acids into urea through a process called deamination. Which statement correctly describes this process and its significance?
- A. Deamination removes the carbon-containing part of amino acids to produce energy
- B. Deamination removes the nitrogen-containing part of amino acids, and the resulting urea must be excreted because it is toxic
- C. Deamination combines amino acids to form new proteins for storage in the liver
- D. Deamination breaks amino acids into glucose and glycogen for energy storage