Question

which organ excretes carbon dioxide? heart lungs kidney liver

Explanation:

To determine which organ excretes carbon dioxide, we analyze the functions of each option:

• Heart: Pumps blood, not involved in CO₂ excretion.
• Lungs: In respiration, they expel CO₂ (a waste product of cellular respiration) from the body during exhalation.
• Kidney: Filters blood to excrete urea, salts, and water (urine), not CO₂.
• Liver: Processes nutrients, detoxifies, and produces bile, not CO₂ excretion.

Answer:

B. Lungs (assuming the options are labeled as A. Heart, B. Lungs, C. Kidney, D. Liver)