Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
Correct answer: D. Trimethylamine oxide
- A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment
- B. Trimethyl alanine
- C. Ammonia
- D. Trimethylamine oxide
Explanation
Trimethylamine oxide, commonly called TMAO, acts as an important osmolyte in marine animals and helps maintain internal solute balance in salty surroundings. Students may choose trimethyl alanine because its name resembles TMAO, but trimethylamine oxide is the relevant compound.
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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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