Download Unit 1: Atomic Theory

Unit 1: Human Digestion and Enzymes
Nutrition
Course
I have
learnt
this

recall sources and describe functions of carbohydrate, protein, lipid (fats and oils),
vitamins A , D and C, the mineral ions calcium and iron, water and dietary fibre as
components of the diet
DS
yr 9

understand that energy requirements vary with activity levels, age and pregnancy
S
yr 9

recall how to carry out a simple experiment to determine the energy content in a food sample.
S
yr 9
Enzymes

describe the tests for glucose , starch , lipids and protein

recall chemical structure of carbohydrates, proteins and lipids as large molecules made
from smaller units: starch and glycogen from sugars; protein from amino acids; lipid from fatty
acids and glycerol.
S

understand the role of enzymes as biological catalysts and understand how their functioning
can be affected by changes in temperature and pH (CW)
DS
IGCSE Sep Biology 2010 Unit 1 Digestion
DS
I have
revised
this
I need
some
more
help with
this

describe how to carry out simple controlled experiments to illustrate how enzyme activity can
be affected by changes in temperature
DS
Digestive System

recognise the structures of the human alimentary canal and describe in outline the functions
of the mouth, oesophagus, stomach, small intestine, large intestine, and pancreas
DS

understand the processes of ingestion, digestion, absorption, assimilation and egestion
DS

explain how and why food is moved through the gut by peristalsis
DS

understand the role of digestive enzymes in breaking down large molecules to small
molecules, to include;
the digestion of starch to glucose by amylase and maltase,
the digestion of proteins to amino acids by proteases
the digestion of lipids to fatty acids and glycerol by lipases
DS

recall that bile is produced by the liver and stored in the gall bladder, and understand the role
of bile in neutralising stomach acid and emulsifying lipids
DS

explain how the structure of a villus helps absorption of the products of digestion in the small
intestine
DS



Biology 4U
Chapter 3 Enzymes
Read p 29 – 34.
Questions 1 to 8 on page 38. Also q 8,9,10 on page 42.
Chapter 4 Digestion
Read p 44 – 50, 52- 53, 57-61.
Questions 1 to 7 on page 67 and q 1,2,3 on p 195.
IGCSE Sep Biology 2010 Unit 1 Digestion