Question 1 of 3 · No calculator needed
Which sequence shows increasing biological organisation?
Organelles operate within cells; similar cells form tissues, tissues form organs and coordinated organs form organ systems.
Pearson Edexcel International GCSE · International GCSEHuman Biology,
Human Biology,
one step at a time.
Specification 4HB1. Explore a topic, practise the skill, and see where to focus next.
Try three questions →Explore the topic map ↓383original questions
12mapped areas
Pearson Edexcel International GCSE · 4HB1LearningP is independent of Pearson Edexcel International GCSE. Use the current official documents for assessment requirements.
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Try three different Human Biology skills from this Pearson Edexcel International GCSE route. See what went right, understand a mistake, and find a useful next step.
3questions · 3 skills
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Question 2 of 3 · No calculator needed
Why may urine become more concentrated after heavy sweating?
Water loss raises blood osmolarity, increasing ADH release; more water is reabsorbed, producing a smaller volume of concentrated urine.
Question 3 of 3 · No calculator needed
Why must meiosis produce haploid gametes?
Each gamete contributes one chromosome set, so fusion restores the species' diploid number rather than doubling it each generation.
These tiles show your answers to three questions. They are a starting point, not a mastery score or grade prediction.
Cells and tissues
Correct answer: Organelle → cell → tissue → organ → organ system
Organelles operate within cells; similar cells form tissues, tissues form organs and coordinated organs form organ systems.
Homeostatic mechanisms
Correct answer: More ADH increases water reabsorption by kidney collecting ducts
Water loss raises blood osmolarity, increasing ADH release; more water is reabsorbed, producing a smaller volume of concentrated urine.
Reproduction and heredity
Correct answer: Fertilisation can restore the diploid chromosome number
Each gamete contributes one chromosome set, so fusion restores the species' diploid number rather than doubling it each generation.
For parents: look at the explanation together. A correct answer is encouraging; a missed answer gives you something specific to work on. Broader practice over time is needed to understand progress.
YOUR TOPIC MAP
12 areasFind your starting point.
01Cells and tissues
Specification reference: 1
Rough endoplasmic reticulum bears ribosomes and helps process and transport proteins; chromosomes carry DNA, membranes control exchange and mitochondria support aerobic respiration.
Watch for: Do not repeat the wording of Cells and tissues. Explain the underlying rule or relationship, apply it to the context and check the command word.
02Biological molecules
Specification reference: 2
A competitive inhibitor has a sufficiently complementary shape to occupy the active site, reducing substrate binding; increasing substrate concentration can lessen its relative effect.
Watch for: Do not repeat the wording of Biological molecules. Explain the underlying rule or relationship, apply it to the context and check the command word.
03Movement of substances into and out of cells
Specification reference: 3
Water moves across a partially permeable membrane from higher water potential outside to lower water potential inside, so the cell gains water.
Watch for: Do not repeat the wording of Movement of substances into and out of cells. Explain the underlying rule or relationship, apply it to the context and check the command word.
04Bones, muscles and joints
Specification reference: 4
The expanded ends contain a lattice of spongy bone that distributes forces with relatively low mass, beneath a thin compact shell and articular cartilage.
Watch for: Do not repeat the wording of Bones, muscles and joints. Explain the underlying rule or relationship, apply it to the context and check the command word.
05Coordination
Specification reference: 5
Schizophrenia is a complex mental illness influenced by biological and environmental factors; symptoms and treatment vary, and care can combine antipsychotic medicine with psychological and social support.
Watch for: Do not repeat the wording of Coordination. Explain the underlying rule or relationship, apply it to the context and check the command word.
06Nutrition and energy
Specification reference: 6
Heat reduces viable spoilage and pathogenic microorganisms; hygienic sealing prevents new organisms entering, extending safe storage when the process is correctly controlled.
Watch for: Do not repeat the wording of Nutrition and energy. Explain the underlying rule or relationship, apply it to the context and check the command word.
07Respiration
Specification reference: 7
Respiration transfers chemical energy from substrates such as glucose into usable forms that support active transport, synthesis, movement and temperature maintenance.
Watch for: Do not repeat the wording of Respiration. Explain the underlying rule or relationship, apply it to the context and check the command word.
08Gas exchange
Specification reference: 8
Smoke chemicals damage ciliated epithelium while mucus production persists, so mucus, particles and microorganisms are cleared less effectively and airways become inflamed.
Watch for: Do not repeat the wording of Gas exchange. Explain the underlying rule or relationship, apply it to the context and check the command word.
09Internal transport
Specification reference: 9
A therapeutic antibody can target an antigen enriched on cancer cells, interfering with growth signalling, marking cells for immune attack or carrying a toxic agent; specificity is not absolute.
Watch for: Do not repeat the wording of Internal transport. Explain the underlying rule or relationship, apply it to the context and check the command word.
10Homeostatic mechanisms
Specification reference: 10
Dialysis can sustain life without donor surgery but is time-consuming and intermittent; transplantation can restore continuous function but brings surgery, rejection and immunosuppression risks.
Watch for: Do not repeat the wording of Homeostatic mechanisms. Explain the underlying rule or relationship, apply it to the context and check the command word.
11Reproduction and heredity
Specification reference: 11
Polydactyly causes extra fingers or toes and is usually expressed with one dominant allele. A new mutation can arise in a gamete or early embryo even when neither parent's body cells carry it.
Watch for: Do not repeat the wording of Reproduction and heredity. Explain the underlying rule or relationship, apply it to the context and check the command word.
12Disease
Specification reference: 12
Vaccine antigens stimulate specific lymphocytes and memory-cell formation without causing the full disease. A faster secondary response lowers infection and onward transmission, indirectly protecting susceptible people when uptake is high.
Watch for: Do not repeat the wording of Disease. Explain the underlying rule or relationship, apply it to the context and check the command word.
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Pearson Edexcel International GCSE · International GCSE · Human Biology · 4HB1
Issue 2, September 2024; current checked 28 August 2026
Source checked: 2026-08-28. The current official specification controls assessment requirements and option choices.
Can parents and students try LearningP before signing up?
Yes. This page offers three original questions from three different skills on this exact course. Each answer has an explanation, followed by a sample heatmap showing what was correct and what to revisit. No account is needed, and taster answers are not saved.
What does the three-question heatmap tell a parent?
It shows the outcome of these three answers and gives a specific skill to discuss or practise next. It is not a full assessment, a mastery score or a grade prediction. Broader practice over time is needed to understand progress.
What does the Pearson Edexcel International GCSE International GCSE Human Biology route cover?
LearningP currently maps 12 assessed areas for specification 4HB1. The visible topic map below is derived from the verified route; the current official specification remains controlling.
How many LearningP questions support this route?
The verified source bank contains 383 original LearningP question records for this route. Every mapped area meets the current publication minimum and passed the latest blocker and review audit.
Does LearningP reproduce official exam questions?
No. LearningP uses official specifications and assessment materials to map content and demand, while its practice questions and explanations are independently authored.
Can this page predict an exam grade?
No. LearningP reports practice evidence, coverage, strengths and gaps. It does not guarantee or automatically predict examination outcomes.
Where should current assessment information be checked?
Use the official Pearson Edexcel International GCSE specification and assessment-resource pages linked on this page, together with information supplied by the learner’s school.
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