What are the functions of the skeleton, the types of bone and the parts of a synovial joint, and how do they support physical activity?
The five main functions of the skeleton, the major bones and types of bone, the structure of a synovial joint, and how the skeletal system is applied to sport and physical activity.
A focused CCEA GCSE Physical Education answer on the skeletal system, covering the five main functions of the skeleton, the major bones and types of bone, the structure of a synovial joint, and how the skeleton supports performance in sport.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
CCEA wants you to know the five main functions of the skeleton with sporting examples, name the major bones and types of bone, describe the structure of a synovial joint, and apply all of this to performance in physical activity. The skeleton is the framework on which the whole of "The Body at Work" is built, so a secure grasp here supports the muscular, movement and exercise topics.
The five main functions of the skeleton
Each function can be applied to sport. Support keeps a gymnast steady in a handstand. Protection lets a hockey goalkeeper take a ball on a padded but bony shin. Movement lets a footballer swing the leg to strike a ball. Blood cell production supplies the red blood cells that carry oxygen to working muscles. Mineral storage keeps the bones strong enough to take the load of a weightlifter.
Types of bone
You should be able to locate the major bones: the cranium, vertebrae, clavicle, scapula, humerus, radius and ulna in the arm, the ribs, pelvis, femur, patella, tibia and fibula in the leg.
The structure of a synovial joint
A synovial joint is a freely moving joint, and it is where most sporting movement happens.
| Feature | What it is | What it does in sport |
|---|---|---|
| Synovial fluid | A slippery fluid in the joint | Lubricates so bones move smoothly and do not wear |
| Cartilage | Smooth tissue on the bone ends | Cushions and absorbs shock on landing or impact |
| Ligaments | Tough bands joining bone to bone | Hold the joint together and keep it stable |
| Joint capsule | A bag enclosing the joint | Holds in the synovial fluid and supports the joint |
| Tendons | Join muscle to bone (at the joint) | Transmit the muscle's pull to move the bone |
Examples in context
Example 1. Why the skeleton matters for a sprinter. A sprinter relies on almost every function at once. The leg bones act as levers for movement, driven by powerful muscles. The vertebrae and pelvis support the body and keep it upright through the drive phase. The bone marrow makes the red blood cells that carry oxygen to the leg muscles. The synovial joints at the hip, knee and ankle, lubricated by synovial fluid and cushioned by cartilage, allow a fast, smooth stride without wear. This is why CCEA likes to ask you to apply functions to a named activity.
Example 2. Exercise, bones and health. Weight-bearing exercise such as running or jumping increases bone density, because the stress on the bones makes the body lay down more bone tissue. This reduces the risk of osteoporosis, a condition where bones become brittle and break easily. A balanced diet with enough calcium and vitamin D supports this. CCEA links the skeletal system to long-term health, so it is worth knowing that regular activity strengthens bones as well as muscles.
Try this
Q1. State two functions of the skeleton other than movement. [2 marks]
- Cue. Any two of: support, protection, blood cell production, mineral storage.
Q2. Name the type of joint found at the elbow and the type of bone that the femur is. [2 marks]
- Cue. The elbow is a hinge (synovial) joint; the femur is a long bone.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA 2023 Paper 15 marksThere are five main functions of the skeleton. State each function and give a sporting example of how it is used.Show worked answer →
One mark for each correctly stated function, with the sporting example showing application.
Support: the skeleton holds the body upright and gives it shape, for example keeping a gymnast in a balanced handstand.
Protection: bones surround vital organs, for example the cranium protecting the brain from a blow in boxing or rugby.
Movement: bones act as levers that muscles pull on, for example the leg bones moving to allow a footballer to kick.
Blood cell production: red and white blood cells are made in the bone marrow, for example supplying the red cells that carry oxygen to a runner's muscles.
Mineral storage: bones store minerals such as calcium and phosphorus, released to keep bones strong for a weightlifter.
Markers reward the five functions named (support, protection, movement, blood cell production, mineral storage), each with a relevant sporting example.
CCEA 2021 Paper 14 marksDescribe the structure of a synovial joint and explain how two named features help during physical activity.Show worked answer →
Two marks for naming features and two for explaining how they help movement.
A synovial joint is enclosed by a joint capsule and lined by the synovial membrane, which releases synovial fluid.
Synovial fluid lubricates the joint, reducing friction so the bones move smoothly and the joint does not wear, for example at the knee of a sprinter.
Cartilage covers the ends of the bones; it is smooth and acts as a shock absorber, cushioning impact when a long jumper lands.
Ligaments join bone to bone and hold the joint together, keeping it stable so it is not dislocated during a tackle.
Markers reward named features (synovial fluid, cartilage, ligaments, joint capsule) each linked to a function such as lubrication, cushioning or stability in sport.
Related dot points
- The major muscles of the body, how muscles work in antagonistic pairs as agonist and antagonist, the types of muscle (voluntary, involuntary and cardiac), and the types of contraction (isotonic and isometric) applied to physical activity.
A focused CCEA GCSE Physical Education answer on the muscular system, covering the major muscles, antagonistic muscle pairs and the roles of agonist and antagonist, the types of muscle, and isotonic and isometric contraction in sport.
- The types of synovial joint (hinge and ball and socket), the types of movement at joints (flexion, extension, abduction, adduction, rotation and circumduction), and how joints and movement are applied to physical activity.
A focused CCEA GCSE Physical Education answer on movement and joints, covering the types of synovial joint, the range of movements (flexion, extension, abduction, adduction, rotation and circumduction), and how joints and movement are applied to sport.
- The structure of the heart and the pathway of blood, the double circulatory system, the three types of blood vessel, and heart rate, stroke volume and cardiac output applied to physical activity.
A focused CCEA GCSE Physical Education answer on the cardiovascular system, covering the heart and the pathway of blood, the double circulatory system, arteries, veins and capillaries, and heart rate, stroke volume and cardiac output in sport.
- The immediate (short-term) effects of exercise on the muscular, cardiovascular and respiratory systems, and the long-term effects of regular training on these systems, applied to physical activity and performance.
A focused CCEA GCSE Physical Education answer on the effects of exercise, covering the immediate (short-term) effects on the muscular, cardiovascular and respiratory systems, and the long-term effects of regular training, applied to performance.
- The structure of the respiratory system, the mechanism of breathing, gas exchange at the alveoli, the lung volumes (tidal volume, vital capacity and minute ventilation), and aerobic and anaerobic respiration applied to physical activity.
A focused CCEA GCSE Physical Education answer on the respiratory system, covering its structure, the mechanism of breathing, gas exchange at the alveoli, lung volumes including tidal volume and vital capacity, and aerobic and anaerobic respiration in sport.