Digestive, Circulatory, Respiratory and Nervous Systems — O/L Science

How do I practise Digestive, Circulatory, Respiratory and Nervous Systems?

1 question with a worked solution · 6 marks

1. 2021 · Paper II · 6 marks
   Question 8 is a structured essay on digestion in the human body. It asks you to cover the organs where digestion happens and the enzymes involved, the role of the villi in the small intestine, and one feature of the circulatory system that carries digested nutrients to the cells.
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   (i) Mouth — salivary amylase breaks starch to maltose. Stomach — pepsin (protease) digests proteins in acidic conditions. Small intestine — pancreatic amylase, lipase (fats → fatty acids + glycerol), protease complete digestion. (ii) Villi greatly increase the surface area of the small intestine for absorption. They have a rich blood capillary network and a lacteal (lymph vessel) for fat absorption. (iii) Blood plasma carries dissolved nutrients (glucose, amino acids) via blood vessels to all body cells.
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2021, Paper II, Question 8 · https://doenets.lk/pastpapers

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