Applied anatomy and physiology — AQA A-Level Physical Education

Applied anatomy and physiology is the foundational topic of AQA A-Level Physical Education. It covers the structure and function of the skeletal, muscular, cardiovascular, and respiratory systems, and how they interact to produce movement and sustain exercise. You will learn about joint types, muscle contraction, the sliding filament theory, and the neural control of movement.

This topic is essential because it underpins all other areas of the course, including biomechanics, exercise physiology, and sports psychology. Understanding how the body responds and adapts to exercise allows you to analyse performance, design training programmes, and explain fatigue and recovery. It also provides the scientific basis for answering applied questions in the exam.

• →The skeletal system provides a framework for movement, protection, mineral storage, and blood cell production. Joints are classified as fibrous, cartilaginous, or synovial, with synovial joints allowing the greatest range of movement.
• →Muscles work in antagonistic pairs to produce movement. The agonist (prime mover) contracts concentrically to create movement, while the antagonist relaxes or contracts eccentrically to control it. Fixators stabilise the origin, and synergists assist the agonist.
• →The sliding filament theory explains muscle contraction: myosin heads attach to actin filaments, forming cross-bridges, and pull them towards the centre of the sarcomere, shortening the muscle fibre. This requires ATP and calcium ions.
• →The cardiovascular system transports oxygen, nutrients, and hormones to working muscles and removes carbon dioxide and waste products. Cardiac output (Q) is the product of heart rate (HR) and stroke volume (SV), and it increases during exercise to meet demand.
• →The respiratory system supplies oxygen and removes carbon dioxide. Minute ventilation (VE) is the product of respiratory rate (RR) and tidal volume (TV). Chemoreceptors regulate breathing by detecting changes in blood CO2, pH, and O2 levels.

• Identifies that anticipatory (pre-exercise) changes include increased heart rate, stroke volume, ventilation and redirected blood flow, driven by sympathetic activity and adrenaline.
• Explains that during exercise of differing intensities, cardiac output increases, with stroke volume dominating at lower intensities and heart rate contributing more as intensity rises.
• Describes respiratory changes during exercise: increased tidal volume and breathing frequency raise pulmonary ventilation and oxygen uptake.
• States that during recovery, heart rate and ventilation decline gradually, oxygen debt or excess post-exercise oxygen consumption repays oxygen deficit and lactate is removed.
• Distinguishes the roles of the musculo-skeletal, cardio-respiratory and neuro-muscular systems in producing and supporting movement at each phase.
• Accurately reads axes, units and scales, and describes the overall trend shown in the data or graph.
• Quotes specific values or points from the graph to support the description, such as peak heart rate or the time taken to return towards resting values.
• Links each identified change to the relevant body system, for example increased stroke volume to cardio-respiratory function or motor unit recruitment to neuro-muscular control.
• Explains how the energy systems contribute differently according to the intensity and duration of the activity, using the data as evidence.
• Describes the recovery process shown in the data, including the decline in heart rate, ventilation and blood lactate over time.
• Uses correct physiological terminology consistently and applies it to the sporting context given.

• 💡For multiple-choice items, eliminate options that reverse the direction of change, such as claiming stroke volume falls during exercise.
• 💡Check whether the question specifies pre-exercise, during exercise or recovery, because the correct response differs by phase.
• 💡Use the relationship cardiac output = heart rate × stroke volume to test whether a numerical option is plausible.
• 💡Read the intensity qualifier carefully: low, moderate and maximal exercise produce different dominant mechanisms.
• 💡Plan your response by identifying the command word, the data source and the physiological systems the question targets.
• 💡Use data explicitly: quote values, times or gradients from the graph to support each point you make.
• 💡Structure extended answers around the phases shown, such as during exercise and during recovery, so every part of the question is addressed.
• 💡Define key terms briefly before applying them, which demonstrates understanding and keeps the explanation precise.
• 💡Always use specific anatomical terminology. Instead of saying 'the arm bends', say 'flexion at the elbow joint'. Instead of 'the muscle gets shorter', say 'the agonist contracts concentrically'. This demonstrates precise knowledge and secures marks.
• 💡When explaining physiological responses, always link the response to its trigger and its purpose. For example: 'Chemoreceptors detect increased CO2, which stimulates the medulla oblongata to increase respiratory rate, thereby increasing oxygen delivery to working muscles.'
• 💡For 6-mark questions, use a structured approach: define the key terms, describe the response or mechanism, explain the physiological reason, and apply it to the sporting context given in the question. This ensures you hit all assessment objectives.

• Thinking heart rate returns to resting level immediately exercise stops; in fact it declines gradually, and the rate of decline depends on fitness and exercise intensity.
• Confusing cardiac output with stroke volume; cardiac output is the product of heart rate and stroke volume, so it is always the larger quantity.
• Assuming ventilation increases only by breathing faster; tidal volume also rises substantially, especially at moderate intensity.
• Believing lactate is the sole cause of fatigue; hydrogen ion accumulation and other metabolic factors also contribute.
• Describing the shape of the graph without quoting any values; marks depend on using specific data points as evidence.
• Mixing up the energy systems, for example claiming the aerobic system dominates a 100 m sprint; match the system to the intensity and duration shown.
• Ignoring the units on the axes, which leads to incorrect interpretation of the magnitude of change.
• Treating recovery as an instant return to resting values rather than a gradual process with different rates for different variables.
• Students often think that muscles can push as well as pull. In reality, muscles can only contract and pull on bones; they cannot push. Movement in the opposite direction is caused by an opposing muscle (the antagonist) or by gravity.
• Many students confuse the terms 'origin' and 'insertion'. The origin is the fixed attachment point (usually proximal), while the insertion is the movable attachment point (usually distal). Remember: origin = stationary, insertion = moves.
• Students frequently state that breathing rate increases during exercise solely because of a lack of oxygen. In fact, the primary stimulus for increased ventilation is a rise in carbon dioxide (hypercapnia) and a drop in blood pH, detected by chemoreceptors.

1. 1Days 1-2: Create a set of flashcards for the skeletal system, covering bone types, joint classifications, and the major bones and joints of the body. Use diagrams to label key structures.
2. 2Days 3-4: Study the muscular system, focusing on the major muscle groups, their origins and insertions, and their roles in movement. Practise identifying agonist, antagonist, synergist, and fixator muscles for common sporting actions.
3. 3Days 5-6: Learn the cardiovascular and respiratory systems. Memorise the equations for cardiac output (Q = HR x SV) and minute ventilation (VE = RR x TV). Create a table comparing acute responses and chronic adaptations to exercise.
4. 4Days 7-8: Apply your knowledge to exam-style questions. Focus on 6-mark questions that require you to link structure to function and explain physiological mechanisms. Use the mark schemes to check your answers.
5. 5Days 9-10: Review all topics using active recall and spaced repetition. Test yourself on key definitions, equations, and the sequence of events in the sliding filament theory and neural control of muscle contraction.

• 📋Multiple-choice and short-answer questions (1-2 marks) testing recall of definitions, equations, or identification of structures. Advice: Learn key terms and equations precisely; do not lose easy marks.
• 📋Data analysis questions (3-4 marks) requiring you to interpret graphs or tables showing physiological responses to exercise. Advice: Read the axes carefully, identify trends, and use data to support your answer.
• 📋Extended writing questions (6-9 marks) asking you to explain a physiological mechanism or analyse a sporting performance. Advice: Use a structured approach, include specific terminology, and link every point to the question context.
• 📋Applied anatomy questions (4-6 marks) requiring you to identify joint movements, muscle roles, and contraction types for a given sporting action. Advice: Practise analysing a range of sporting actions and use correct anatomical terminology.