Anatomy and physiology
Connect the skeleton, muscles, breathing, circulation and biomechanics to safe performance. Explain what changes during exercise, why the body responds, and how adaptations and movement mechanics affect a named syllabus activity.
Exam scope and assessment notes
Mapped to the A*–G Cambridge IGCSE Physical Education 0413 syllabus. The 2025–2026 and 2027–2028 syllabuses state that there are no significant changes affecting teaching. Original StudyForA teaching and formative written practice aligned to Cambridge IGCSE Physical Education. These are not Cambridge questions, mark schemes or grades. The course can explain and rehearse theory, planning and self-analysis; it cannot observe, train, authenticate or mark a learner’s physical performance. Coursework must be completed safely with the school or centre, which assesses and standardises the performance for Cambridge moderation. Follow the centre’s health and safety guidance; these examples are not individual medical or training advice.
Before you begin
- Choose one activity from the official activity list when applying theory.
- Use the named system or principle, then explain its effect on a specific performance.
- Separate a written practice answer from practical performance and centre assessment.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which approach best explains anatomy and physiology?
What you will learn
- Explain the skeleton’s support, movement, protection and blood-cell functions; locate syllabus bones, classify bones, and describe joint types, synovial-joint structures and movement.
- Locate named muscles; explain agonist and antagonist action, isotonic and isometric contractions, tendons, and slow- and fast-twitch fibre differences.
- Trace air and blood pathways; explain gas exchange, breathing volumes, blood components, vessels, heart function and cardiac output.
- Explain immediate and long-term exercise effects, fatigue and recovery, and apply force, acceleration and lever principles to movement.
Skeletal and muscular systems
The skeleton gives shape and support, provides attachment for movement, protects organs and produces red blood cells. Locate the cranium, clavicle, scapula, arm and hand bones, ribs, pelvis, leg and foot bones; classify long, short and flat bones. Distinguish fixed, slightly movable and freely movable synovial joints. At a synovial joint, the capsule, cartilage, synovial membrane and fluid, and ligaments help protect and support movement.
Use the named joint movements accurately: flexion and extension, abduction and adduction, rotation, plantar flexion and dorsiflexion. Locate the deltoid, pectorals, trapezius, latissimus dorsi, biceps, triceps, abdominals, gluteals, hip flexors, hamstring and quadriceps groups, gastrocnemius and tibialis anterior. Tendons attach muscle to bone. At a moving joint, an agonist contracts while its antagonist controls the opposite action. Isotonic actions change muscle length; isometric actions create tension without a change in length. Slow-twitch fibres resist fatigue and support aerobic work; fast-twitch fibres can produce greater force but fatigue sooner.
Respiratory and circulatory systems
Air travels through the mouth or nasal passage, trachea, bronchi and bronchioles to the alveoli. Their large surface area, thin moist walls and dense capillary supply support diffusion: oxygen moves into blood and carbon dioxide moves out. The diaphragm and intercostal muscles change chest volume during breathing. Tidal volume is air per breath; minute ventilation is tidal volume multiplied by breathing rate. Vital capacity and residual volume describe different usable and remaining volumes in the lungs.
Plasma transports dissolved substances; red cells carry gases using haemoglobin; white cells defend against pathogens; platelets help clotting. Arteries carry blood away from the heart, capillaries allow exchange, and veins return blood. Trace the syllabus route through the vena cava, atria, ventricles, pulmonary artery, lungs, pulmonary vein and aorta; valves prevent backflow. Cardiac output = heart rate × stroke volume. During exercise, heart rate, stroke volume, cardiac output and ventilation change to meet demand. Training can alter resting pulse, heart size, stroke volume and tolerance of exercise; distinguish an immediate response from a long-term adaptation.
Exercise, fatigue and simple biomechanics
Explain oxygen debt and the recovery period as processes associated with restoring the body after exercise; connect fatigue, lactic acid tolerance and recovery without claiming that one symptom has a single cause. Force is a push or pull, and force = mass × acceleration. Identify gravity, air resistance, muscular force and ground-reaction force in movement. A lever has a fulcrum, effort and resistance; first-, second- and third-class levers place these differently. Apply the classification to a movement and state the joint and muscle action rather than memorising an isolated label.
Sources for this lesson
- Cambridge IGCSE Physical Education 0413 syllabus for examination in 2027–2028
- Cambridge IGCSE Physical Education 0413 syllabus for examination in 2025–2026
- Cambridge IGCSE Physical Education 0995 syllabus for examination in 2027–2028
- Cambridge IGCSE Physical Education 0995 syllabus for examination in 2025–2026
- Cambridge IGCSE Physical Education 0413 qualification and assessment page
- Cambridge IGCSE Physical Education 0995 qualification, grading and availability page
- Cambridge coursework guidelines for Physical Education
- Official 0413 syllabus used for the selected grading route
Pause and explain
What makes an applied answer about anatomy and physiology convincing?
Worked example
A basketball player jumps for a rebound. Explain the movement at the knee and ankle, identify an agonist–antagonist pair, then calculate cardiac output if heart rate is 150 beats per minute and stroke volume is 0.08 litres per beat.
Show the worked solution
- Name the joint movements during take-off and landing.
- Identify the muscles that produce and control one movement.
- Use cardiac output = heart rate × stroke volume and retain the units.
Answer During take-off the knee extends and the ankle plantar-flexes; landing involves controlled flexion to absorb force. The quadriceps extend the knee while the hamstrings act as antagonists, and the gastrocnemius helps plantar-flex the ankle. Cardiac output = 150 × 0.08 = 12 litres per minute. The calculation describes this example; it is not a target for a real performer.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
During a tennis serve, the elbow extends. Explain the role of the biceps and triceps and describe the movement at the elbow.
Give me a hint
Identify which muscle group shortens to create extension and which controls the opposite action.
Compare my reasoning
- State that elbow extension increases the angle at the joint.
- Name the triceps as the agonist and explain its contraction.
- Name the biceps as the antagonist and explain its role.
Elbow extension increases the angle between the upper arm and forearm. The triceps is the agonist: it contracts to produce the extension. The biceps is the antagonist and lengthens or relaxes to allow the movement. The pair can reverse roles when the elbow flexes.
Look for these in your work
- Uses accurate subject knowledge
- Applies it to the activity
- Explains the link
A runner’s tidal volume rises from 0.5 litres to 2.0 litres while breathing rate rises from 12 to 40 breaths per minute. Calculate minute ventilation at rest and during exercise, then explain the change.
Give me a hint
Multiply volume per breath by breaths per minute in each condition.
Compare my reasoning
- Write minute ventilation = tidal volume × breathing rate.
- Calculate and label both values in litres per minute.
- Explain how the change supports gas exchange during exercise.
At rest, minute ventilation = 0.5 × 12 = 6 litres per minute. During exercise it is 2.0 × 40 = 80 litres per minute. Greater ventilation moves more air through the lungs each minute, supporting increased oxygen uptake and carbon-dioxide removal. These figures are a practice example, not a personalised health measure.
Look for these in your work
- Answers every part
- Shows working or evidence where useful
- Explains why the point matters
Original practice claim: ‘A stronger heart rate response always means an athlete is fitter.’ Evaluate the claim using the difference between immediate response and training adaptation.
Give me a hint
Compare the same workload, stroke volume, recovery and individual context.
Compare my reasoning
- Explain why heart rate rises during exercise.
- Identify a longer-term adaptation that may change resting or submaximal response.
- State why a single reading cannot rank fitness reliably.
Heart rate rises during exercise to help increase cardiac output, but a larger response at one moment does not by itself show greater fitness. At the same submaximal workload, training may increase stroke volume and reduce the heart rate needed to deliver blood; recovery and the individual’s starting condition also matter. A fair comparison needs the same protocol and context, and medical or training decisions should be made with qualified support.
Look for these in your work
- Tests the original claim
- Uses a relevant alternative or limitation
- Reaches a supported judgement
Common mistakes
- Confusing tendons, ligaments and cartilage
- Naming a muscle without linking its action to the joint movement
- Swapping the pulmonary artery and pulmonary vein
- Treating a training adaptation as an immediate exercise response
- Using cardiac output units inconsistently
What can you explain now?
Explain the skeleton’s support, movement, protection and blood-cell functions; locate syllabus bones, classify bones, and describe joint types, synovial-joint structures and movement.
Compare with the explanation
Explain immediate and long-term exercise effects, fatigue and recovery, and apply force, acceleration and lever principles to movement.
Connect the skeleton, muscles, breathing, circulation and biomechanics to safe performance. Explain what changes during exercise, why the body responds, and how adaptations and movement mechanics affect a named syllabus activity.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Recall one syllabus principle from anatomy and physiology, connect it to an approved physical activity, and explain one condition that changes its effect.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.