📚 Year 10 Edexcel PE: Core Knowledge Summary | Year 10 Edexcel 体育：核心知识点梳理
This article provides a comprehensive overview of the core knowledge points covered in Year 10 Edexcel GCSE Physical Education. Understanding these key concepts will help you build a strong foundation for your exams and coursework.
本文全面梳理了 Year 10 Edexcel GCSE 体育课程的核心知识点。理解这些关键概念将助你为考试和课业打下坚实基础。
1. The Skeletal System | 骨骼系统
The skeleton gives the body its shape, provides support and allows us to stand upright. Without it, we would collapse.
骨骼赋予身体形状，提供支撑并让我们直立。没有骨骼，身体就会瘫软。
Bones protect vital organs: the skull protects the brain, the rib cage shields the heart and lungs, and the vertebrae protect the spinal cord.
骨骼保护重要器官：颅骨保护大脑，肋骨保护心脏和肺，脊椎保护脊髓。
Long bones like the femur act as levers for movement, while the bone marrow inside produces red and white blood cells. Bones also store minerals such as calcium and phosphorus.
像股骨这样的长骨充当运动杠杆，而内部的骨髓产生红血球和白血球。骨骼还储存钙和磷等矿物质。
Joints are where two or more bones meet, allowing movement. Hinge joints (e.g., knee, elbow) allow flexion and extension, while ball-and-socket joints (e.g., shoulder, hip) allow movement in many directions.
关节是两块或多块骨骼相连的部位，允许运动。屈戌关节（如膝、肘）可做屈伸运动，球窝关节（如肩、髋）可做多方向运动。
2. The Muscular System | 肌肉系统
Skeletal muscles are attached to bones by tendons and work in pairs to bring about movement. The muscle that contracts is the agonist (prime mover), and the one that relaxes is the antagonist.
骨骼肌通过肌腱附着在骨骼上，通过成对作用产生运动。收缩的肌肉称为主动肌（原动肌），放松的肌肉为拮抗肌。
For example, when bending the elbow (flexion), the biceps contracts as the agonist and the triceps relaxes as the antagonist. When straightening the arm (extension), the roles reverse.
例如，屈肘时肱二头肌收缩作为主动肌，肱三头肌放松作为拮抗肌。伸臂时角色互换。
Isotonic contractions involve movement; they can be concentric (muscle shortens) or eccentric (muscle lengthens under tension). Isometric contractions occur when the muscle tenses but there is no movement, such as holding a plank position.
等张收缩涉及运动，分为向心收缩（肌肉缩短）和离心收缩（肌肉拉长且受力）。等长收缩是肌肉绷紧但不发生运动，如平板支撑。
Key muscles to know for Edexcel include the latissimus dorsi (back), deltoid (shoulder), pectorals (chest), abdominals (stomach), quadriceps (front thigh), hamstrings (back thigh), gluteals (buttocks) and gastrocnemius (calf).
Edexcel 需掌握的关键肌肉包括：背阔肌（背部）、三角肌（肩部）、胸肌、腹肌、股四头肌（大腿前部）、绳肌（大腿后部）、臀肌和腓肠肌（小腿）。
3. The Cardiovascular System | 心血管系统
The heart has four chambers: right atrium, right ventricle, left atrium and left ventricle. The right side pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body.
心脏有四个腔室：右心房、右心室、左心房和左心室。右侧将缺氧血泵送到肺部，左侧将富氧血泵送到全身。
Arteries carry blood away from the heart under high pressure and have thick, elastic walls. Veins return blood to the heart and have valves to prevent backflow. Capillaries are tiny vessels where gas exchange occurs.
动脉将血液从心脏导出，压力高，管壁厚而有弹性。静脉将血液送回心脏，具有防止倒流的瓣膜。毛细血管是气体交换的微细血管。
Cardiac output (Q) equals heart rate (HR) multiplied by stroke volume (SV). During exercise, both HR and SV increase, raising cardiac output to deliver more oxygen to working muscles.
心输出量（Q）等于心率（HR）乘以每搏输出量（SV）。运动时心率和每搏输出量均增加，从而提升心输出量，为工作肌肉输送更多氧气。
Blood is composed of plasma, red blood cells (carry oxygen using haemoglobin), white blood cells (fight infection) and platelets (help with clotting).
血液由血浆、红细胞（利用血红蛋白运输氧气）、白细胞（抵抗感染）和血小板（帮助凝血）组成。
4. The Respiratory System | 呼吸系统
Air enters through the nose or mouth, travels down the trachea, into the bronchi, then bronchioles, and finally reaches the alveoli where gas exchange takes place.
空气从鼻或口进入，经气管下行至支气管，再至细支气管，最终到达肺泡进行气体交换。
In the alveoli, oxygen diffuses into the blood, and carbon dioxide diffuses out to be exhaled. This process is called gaseous exchange and occurs down a concentration gradient.
在肺泡中，氧气扩散入血液，二氧化碳扩散出以呼出体外。此过程称为气体交换，沿浓度梯度进行。
Key lung volumes: tidal volume (amount of air breathed in and out per normal breath), vital capacity (maximum air that can be exhaled after maximum inhalation) and minute ventilation (tidal volume x respiratory rate). During exercise, tidal volume and breathing rate rise.
关键肺容量：潮气量（每次正常呼吸吸入或呼出的气量），肺活量（最大吸气后能呼出的最大气量），以及每分通气量（潮气量 x 呼吸频率）。运动时潮气量和呼吸频率均增加。
5. Aerobic and Anaerobic Exercise | 有氧运动与无氧运动
Aerobic exercise uses oxygen to break down glucose and produce energy, carbon dioxide and water. It is used for lower-intensity, longer-duration activities like jogging or cycling.
有氧运动利用氧气分解葡萄糖，产生能量、二氧化碳和水。适用于较低强度、长时间的活动，如慢跑或骑自行车。
Glucose + Oxygen -> Energy + Carbon dioxide + Water
葡萄糖 + 氧气 -> 能量 + 二氧化碳 + 水
Anaerobic exercise breaks down glucose without oxygen, producing energy and lactic acid. It fuels high-intensity, short-burst activities such as sprinting or weightlifting.
无氧运动在无氧条件下分解葡萄糖，产生能量和乳酸。为高强度、短暂爆发的活动（如短跑或举重）提供能量。
Glucose -> Energy + Lactic acid
葡萄糖 -> 能量 + 乳酸
After intense exercise, the body continues to take in extra oxygen to repay the oxygen debt, remove lactic acid, and restore the body to its resting state. This is known as EPOC.
激烈运动后，身体会继续摄取额外氧气以偿还氧债，清除乳酸，并使身体恢复安静状态。这就是运动后过量氧耗（EPOC）。
6. Movement Analysis: Levers and Planes | 运动分析：杠杆与平面
A lever consists of a rigid bar (bone), a fulcrum (joint), an effort (muscle contraction) and a load (resistance). The arrangement of these determines the lever class.
杠杆由刚性杆（骨）、支点（关节）、动力（肌肉收缩）和阻力（负荷）组成，它们的排列方式决定了杠杆类别。
First-class lever: fulcrum in the middle (e.g., nodding the head). Second-class lever: load in the middle (e.g., standing on tiptoe). Third-class lever: effort in the middle (e.g., bending the elbow). Most movements in the body are third-class levers, which favour speed and range over strength.
第一类杠杆：支点居中（如点头）。第二类杠杆：阻力居中（如提踵）。第三类杠杆：动力居中（如屈肘）。人体大多数运动属于第三类杠杆，有利于速度和活动范围，而非力量。
oad arm. A second-class lever has a mechanical advantage greater than 1, meaning it can move a large load with a small effort.
机械利益 = 动力臂 / 阻力臂。第二类杠杆机械利益大于 1，能以较小的力移动大负荷。
Planes of movement: sagittal (divides body into left and right, e.g., forward roll), frontal (divides body into front and back, e.g., cartwheel) and transverse (divides body into top and bottom, e.g., discus spin). Axes are perpendicular to each plane: the sagittal plane uses the frontal (medial-lateral) axis.
运动平面：矢状面（将身体分为左右，如前滚翻），额状面（将身体分为前后，如侧手翻），水平面（将身体分为上下，如铁饼旋转）。轴与平面垂直：矢状面运动绕额状轴（内外侧轴）进行。
7. Components of Fitness | 体能要素
Health-related components include cardiovascular endurance (ability of heart and lungs to supply oxygen), muscular endurance, muscular strength, flexibility and body composition.
健康相关体能要素包括心血管耐力（心肺供氧的能力）、肌肉耐力、肌肉力量、柔韧性和身体组成。
Skill-related components include agility (changing direction quickly), balance, coordination, power (strength x speed), reaction time and speed.
技能相关体能要素包括灵敏性（快速改变方向）、平衡能力、协调性、爆发力（力量 x 速度）、反应时间和速度。
Fitness tests such as the Cooper run or multi-stage fitness test assess cardiovascular endurance; the sit-and-reach test measures flexibility; the handgrip dynamometer tests strength.
体能测试如库珀跑或多级往返跑测试评估心血管耐力；坐位体前屈测试柔韧性；握力计测试力量。
8. Principles of Training | 训练原则
The principles of training guide how to improve fitness. The acronym SPORT: Specificity, Progression, Overload, Reversibility, Tedium. Overload can be achieved using the FITT principle: Frequency, Intensity, Time, Type.
训练原则指导如何提高体能。缩略
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