Human Biology - 4HB1 PearsonEdexcel

Diet And Digestion

Muhtasari

A teenager, a pregnant woman and a manual labourer sitting down to the same meal do not actually need the same meal. Age, pregnancy, climate and the physical demands of a job all change how much energy and which nutrients a body requires, and getting the balance wrong for long enough produces a recognisable deficiency disease with its own set of symptoms. This topic builds the full picture: what a balanced diet supplies, how the alimentary canal breaks food down into absorbable molecules, and how the small intestine is engineered to get those molecules into the blood as efficiently as possible.

You will also meet the practical side of nutrition that Human Biology students are expected to reason about: calculating and interpreting BMI, linking obesity and high cholesterol to specific diseases, and knowing why hygienic food preparation matters at every stage from the kitchen to the gut. Expect calculation questions, structure-to-function reasoning and at least one question that asks you to identify a deficiency disease from a described set of symptoms.

Malengo

  1. Explain the importance of a balanced diet including the recommended dietary intake of carbohydrates, fats, proteins, vitamins A and C, calcium, iron and fibre
  2. Understand variations in diet related to age, pregnancy, climate and occupation
  3. Know the sources and functions of carbohydrates, proteins, lipids (fats and oils), vitamins A, C and D, and the mineral ions, calcium and iron
  4. Describe the causes and symptoms of deficiency diseases limited to scurvy (lack of vitamin C), anaemia (lack of iron), blindness (lack of vitamin A) and Kwashiorkor (lack of protein)
  5. Know the structures of the human alimentary canal and describe the functions of the mouth, oesophagus, stomach, small intestine, large intestine and pancreas in digestion
  6. Explain how food is moved through the gut by peristalsis including the role of dietary fibre in the process
  7. Understand the role of digestive enzymes including their site of production and action, the digestion of starch to glucose by amylase and maltase, the digestion of proteins to amino acids by proteases (pepsin, trypsin), and the digestion of lipids to fatty acids and glycerol by lipases
  8. Know 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
  9. Understand how the structure of the villus helps absorption of the products of digestion in the small intestine
  10. Know the types, structure and functions of teeth, the factors that affect their growth and how to care for teeth and gums
  11. Understand BMI, including the calculation of BMI, and the role of obesity as a risk factor in early onset of diabetes and the significance of high cholesterol levels in atherosclerosis
  12. Explain the importance of hygienic methods of food preparation, cooking, storage and preservation

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Maelezo ya Somo

Every cell in the body runs on molecules that ultimately came from food: glucose for respiration, amino acids for building proteins, fatty acids for membranes and energy storage. Getting that supply wrong, in either direction, has consequences that show up as specific, well-documented diseases. This topic covers what a balanced diet actually contains, how the gut converts food into absorbable molecules, and how the small intestine is built to get those molecules into the bloodstream.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Diet And Digestion. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. Which enzyme digests starch to maltose? A) Maltase B) Amylase C) Lipase D) Trypsin Answer: B
  2. A deficiency of iron in the diet causes: A) Scurvy B) Kwashiorkor C) Anaemia D) Night blindness Answer: C
  3. Bile is produced by the liver and stored in the: A) Pancreas B) Gall bladder C) Duodenum D) Stomach Answer: B
  4. Which feature of a villus increases the surface area available for absorption? A) The lacteal B) The capillary network C) Microvilli D) The muscle layer Answer: C
  5. A person has a mass of 80 kg and a height of 2.00 m. What is their BMI? A) 16.0 B) 20.0 C) 40.0 D) 160.0 Answer: B

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Human Biology Student Book
Pearson Edexcel International GCSE (9-1) Human Biology Student Book
Manukuu: First edition
Mchapishaji: Pearson Education
Mwaka: 2018
ISBN: 978-0-435-19152-2
Maelezo: Endorsed student book covering the full 4HB1 specification with practicals and exam guidance.

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