Q.Which of the following is removed from our body by lungs?

The lungs remove both carbon dioxide and water from the body, not carbon dioxide alone.

• They expel a large volume of carbon dioxide, roughly two hundred millilitres every minute, as a direct product of respiration.
• Along with this gas, the lungs also release a significant amount of water vapour each day during breathing. …

While the kidneys are the principal excretory organs, several other organs quietly share this job, and the lungs are one of the most active among them.

• The lungs release large quantities of carbon dioxide, amounting to roughly two hundred millilitres every minute, as the direct end product of cellular respiration being carried by the blood to the alveoli and breathed out. …

Method: Identifying Which Body Organ Excretes Which Substance

Use this approach for any question that asks which organ (kidney, lungs, liver, skin) is responsible for removing a particular substance from the body, or what a named organ removes.

Steps

Step 1: Recall that excretion is not a kidney-only job

Although the kidney is the principal excretory organ, several accessory organs handle their own specific wastes: the lungs remove carbon dioxide and water vapour, the liver clears bilirubin, cholesterol, degraded hormones, and some drugs via bile, and the skin removes NaCl, some urea and lactic acid through sweat. Before answering, ask which organ's characteristic waste the question is naming.

Step 2: Check whether the option lists a single substance or a genuine combination …