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SingaporeCombined ScienceQuick questions
Biology: Cells and Human Physiology
Quick questions on The human digestive system explained: O-Level Combined Science
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the alimentary canal?Show answer
Food passes through a long tube, the alimentary canal, in this order:
What are the digestive enzymes?Show answer
Three main classes of enzyme break down the three main food groups:
What is the role of bile?Show answer
Bile, made by the liver and stored in the gall bladder, is not an enzyme. It emulsifies fats, breaking large fat droplets into many small ones. This greatly increases the surface area for lipase to act on, speeding up fat digestion. Bile is also alkaline and neutralises the acid from the stomach.
What is absorption in the small intestine?Show answer
The small molecules are absorbed through the wall of the small intestine into the blood. The small intestine is well adapted:
What is q1?Show answer
State the products of the complete digestion of (a) starch, (b) protein, (c) fat. [3 marks]
What is q2?Show answer
Explain the role of bile in the digestion of fats. [2 marks]
What is q3?Show answer
Describe one way the small intestine is adapted for absorption and explain its effect. [2 marks]
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