What Waste Gases Do Lungs Remove? CO₂, Water Vapor, and Volatile Compounds
The lungs' primary excretory role is gas exchange—removing volatile waste products from blood into exhaled air.
Three Key Waste Products Eliminated
- Carbon Dioxide (CO₂): Primary metabolic waste from aerobic respiration. Diffuses from pulmonary capillaries → alveoli → exhaled. ~200 mL/min at rest.
- Water Vapor (H₂O): ~300–400 mL/day exhaled. Humidifies inspired air; contributes to insensible water loss.
- Volatile Compounds: Acetone (ketosis), ethanol (alcohol), anesthetic gases, environmental toxins (VOCs), isoprene, ammonia—eliminated via pulmonary excretion proportional to blood:gas partition coefficient.
Clinical Applications
- Breath analysis: acetone (DKA), nitric oxide (asthma), volatile organics (toxicology).
- Anesthetic recovery: exhalation clears volatile agents.
- Alcohol breath testing: equilibrium with blood alcohol.
Lungs also regulate pH via CO₂ excretion (respiratory compensation for metabolic acidosis/alkalosis).
Breathwork - Related Articles
- Improve Your Breathing: Exercises for Optimal Lung Capacity
- 10 Effective Home Remedies to Soothe a Cough Naturally
- Mitochondria: Structure and Role in Cellular Respiration
- Natarajasana: A Step-by-Step Guide to the Dancer Pose
- X-Ray Developer Inhalation: Health Risks and Essential Safety Precautions
- The Cough Reflex: Physiology of Airway Protection
- Head Lice and Swimming: Chlorine Doesn't Kill Them