Liver destroys old red blood cells to produce digestive substance called

Step 1: Analyze the question The question asks which digestive substance the liver makes from the breakdown of old red blood cells. Note that "amalyse" is a misspelling of "amylase."

Step 2: Explain the concept Red blood cells live for about 120 days. After that, the liver (and spleen) break them down. Haemoglobin is split into:

• Iron, which is stored or recycled to make new haemoglobin.
• Globin, a protein that is broken down into amino acids.
• Haem, which is converted into bile pigments (bilirubin and biliverdin).

These bile pigments are part of bile, the greenish-yellow fluid made by the liver and stored in the gall bladder. Bile helps digestion by emulsifying fats, which gives lipase a larger surface area to work on. It also neutralizes acidic chyme from the stomach.

Step 3: Check the options

• A. Amylase: an enzyme that digests starch, made by the salivary glands and pancreas. Not from the liver.
• B. Bile: made by the liver, and its pigments come from the breakdown of old red blood cells. ✔
• C. Insulin: a hormone made by the pancreas that lowers blood sugar. It is not a digestive substance.
• D. Lipase: an enzyme that digests fats, made by the pancreas. Not from the liver.
• E. Rennin: an enzyme in the stomach (mainly in infants) that curdles milk.

Step 4: Answer The correct answer is B. bile.

Tip: Remember "Liver → Bile → Bilirubin." Bile is not an enzyme, because it contains no digestive enzymes. It only emulsifies fats.