Which of the following is an example of excretion rather than egestion?
Correct answer: D. The removal of carbon dioxide by the lungs
- A. The passing of undigested cellulose in faeces
- B. The loss of dead cells from the surface of the skin
- C. The removal of hair when it is cut
- D. The removal of carbon dioxide by the lungs
Explanation
Excretion is the removal of the waste products of the body's own metabolism, and carbon dioxide is made by respiration inside every cell, so the lungs are excretory organs. Faeces consist largely of material that was never absorbed into the cells at all, so removing them is egestion. This distinction is a standard exam point and turns on whether the substance was ever part of the body's metabolism.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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