How does the digestive system process food, and what happens in a disorder such as type 2 diabetes?
The structure and function of the digestive system: the organs of the gut, digestion and absorption of nutrients, and a physiological disorder linked to digestion and metabolism (type 2 diabetes) including its causes, effects and management.
A CCEA A2 2 answer on the digestive system: the organs of the gut, the digestion and absorption of nutrients, and a physiological disorder of metabolism (type 2 diabetes), including its causes, risk factors, signs and symptoms and management.
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What this dot point is asking
CCEA wants you to describe the structure and function of the digestive system (the organs of the gut, and the digestion and absorption of nutrients) and to explain a physiological disorder linked to digestion and metabolism. A commonly taught disorder is type 2 diabetes: its causes, risk factors, effects and management.
Structure and function of the digestive system
Food follows an ordered pathway: the mouth (chewing and saliva begin digestion), the oesophagus (carries food to the stomach), the stomach (acid and enzymes continue digestion), the small intestine (the duodenum and ileum, where most digestion and absorption occur), the large intestine (the colon, where water is absorbed), and the rectum and anus (where waste is stored and removed). The liver produces bile (which emulsifies fat) and the pancreas produces digestive enzymes.
Digestion and absorption
The links between structure and function are exactly what CCEA tests: the long, folded small intestine with its villi maximises absorption, just as the alveoli maximise gas exchange. A problem in this system, whether mechanical (a blockage) or metabolic (diabetes), disrupts the supply of nutrients and energy the body depends on.
Type 2 diabetes
Risk factors include obesity, a high-sugar and high-fat diet, physical inactivity, age and family history (again a mix of controllable and uncontrollable). Symptoms include tiredness, increased thirst and frequent urination, and over time high glucose damages the eyes, kidneys, nerves and blood vessels, raising the risk of heart disease. This connects diabetes back to the cardiovascular disorder studied earlier.
Management
Type 2 diabetes is managed by a healthy diet (controlling sugar and fat), weight loss and regular exercise, blood glucose monitoring, oral medication (such as metformin) and, in some cases, insulin. Because lifestyle factors are central, this disorder shows clearly how the health improvement ideas from AS 3 apply to managing a physiological condition.
Try this
Q1. State the correct order of organs food passes through from the mouth. [3 marks]
- Cue. Mouth, oesophagus, stomach, small intestine, large intestine.
Q2. Name the enzyme group that breaks down proteins. [1 mark]
- Cue. Proteases.
Q3. Explain why blood glucose stays high in type 2 diabetes. [3 marks]
- Cue. The body makes too little insulin or the cells resist it, so glucose is not taken up from the blood and stays high.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA A2 2 20196 marksDescribe the journey of food through the digestive system and explain where digestion and absorption take place.Show worked answer →
A 6-mark answer needs the ordered organs plus where digestion and absorption occur.
Pathway: food enters the mouth, where chewing and saliva begin digestion, then passes down the oesophagus to the stomach, where acid and enzymes continue digestion. It then enters the small intestine (duodenum then ileum), where most digestion and absorption occur, then the large intestine (colon), where water is absorbed, ending at the rectum and anus.
Digestion: enzymes break large molecules into small soluble ones, carbohydrases break down carbohydrates, proteases break down proteins, and lipases break down fats, aided by bile from the liver, which emulsifies fat.
Absorption: the small intestine is adapted with villi (a large surface area, thin walls and a rich blood supply) so the products of digestion are absorbed into the blood.
Markers reward the ordered organs, where digestion and absorption occur, and the role of enzymes and villi.
CCEA A2 2 20218 marksExplain the causes and risk factors of type 2 diabetes and describe how it is managed.Show worked answer →
An 8-mark answer needs the mechanism, risk factors, effects and management.
Cause and mechanism: in type 2 diabetes the body either does not produce enough insulin or the cells stop responding to it (insulin resistance). Insulin normally allows cells to take up glucose from the blood, so without effective insulin, blood glucose stays high (hyperglycaemia).
Risk factors: obesity, a poor high-sugar and high-fat diet, physical inactivity, age, and family history; some are controllable (lifestyle) and some are not (age, family history).
Effects: tiredness, increased thirst, frequent urination, and over time damage to the eyes, kidneys, nerves and blood vessels, raising the risk of heart disease.
Management: a healthy diet, weight loss and regular exercise, blood glucose monitoring, oral medication (such as metformin) and, in some cases, insulin.
Markers reward the insulin and glucose mechanism, a range of risk factors, the effects, and lifestyle and medical management.
Related dot points
- The structure and function of the cardiovascular system: the heart, blood vessels and the cardiac cycle, and a physiological disorder of the system (coronary heart disease) including its causes, risk factors, effects and management.
A CCEA A2 2 answer on the cardiovascular system: the structure of the heart and blood vessels, the cardiac cycle and circulation, and coronary heart disease as a physiological disorder, including its causes, risk factors, signs and symptoms, and management.
- The structure and function of the respiratory system: the airways, lungs and gas exchange, the mechanism of breathing, and a physiological disorder of the system (asthma or chronic obstructive pulmonary disease) including its causes, effects and management.
A CCEA A2 2 answer on the respiratory system: the structure of the airways and lungs, gas exchange at the alveoli, the mechanism of breathing, and a physiological disorder (asthma, with reference to chronic obstructive pulmonary disease), including its causes, signs and symptoms and management.
- Monitoring, diagnosis and treatment of physiological disorders: the clinical measurements and investigations used (blood pressure, pulse, peak flow, blood glucose, ECG and spirometry), how disorders are diagnosed, and the lifestyle, medical and surgical treatments available.
A CCEA A2 2 answer on monitoring, diagnosing and treating physiological disorders: the clinical measurements and investigations (blood pressure, pulse, peak flow, blood glucose, ECG and spirometry), how readings are interpreted against normal ranges, and the lifestyle, medical and surgical treatments used.
- The effects of health and ill health on individuals and on those around them, the indicators and measures used to assess physical health, and how needs are identified across the physical, intellectual, emotional and social dimensions.
A CCEA AS 3 answer on the effects of health and ill health on individuals and their families, and the indicators and measurements (such as blood pressure, body mass index, pulse and peak flow) used to assess physical health and identify needs across the dimensions of wellbeing.
- Promoting and supporting health improvement: the components of a healthy lifestyle, how individuals can be supported to improve and maintain wellbeing, the formal and informal support available, and the barriers that make change difficult.
A CCEA AS 3 answer on promoting and supporting health improvement: the components of a healthy lifestyle, how people are supported to change behaviour and maintain wellbeing, the formal and informal sources of support, and the barriers (financial, practical, emotional and social) that make change difficult.
Sources & how we know this
- CCEA GCE Health and Social Care specification — CCEA (2016)