What are the 5 main functions of the skeleton?

The five main functions are: support (holding the body upright), protection (e.g., skull protects brain), movement (bones act as levers for muscles), blood cell production (in bone marrow), and mineral storage (calcium and phosphorus).

What is the difference between axial and appendicular skeleton?

The axial skeleton includes the skull, vertebral column, and ribcage – it forms the central axis. The appendicular skeleton includes the limbs (arms and legs) and the girdles (shoulder and pelvic) that attach them to the axial skeleton.

How does the skeletal system help with movement?

Bones act as levers that muscles pull on to create movement. Joints act as fulcrums. For example, when you kick a ball, your quadriceps pull on the tibia (lever) at the knee joint (fulcrum) to extend the leg.

What are the different types of bones and examples?

Long bones (e.g., femur, humerus) are longer than wide; short bones (e.g., carpals, tarsals) are cube-shaped; flat bones (e.g., cranium, ribs) are thin and curved; irregular bones (e.g., vertebrae) have complex shapes; sesamoid bones (e.g., patella) are embedded in tendons.

Why is the skeleton important for sport?

It provides a rigid framework for muscle attachment, enabling powerful movements. It protects vital organs (e.g., ribs protect lungs in contact sports). Bones store calcium, which is released during exercise to maintain muscle function. Weight-bearing exercise strengthens bones, reducing fracture risk.

What bones make up the shoulder girdle?

The shoulder girdle consists of the clavicle (collarbone) and scapula (shoulder blade). It connects the arms to the axial skeleton and allows a wide range of movement at the shoulder joint.

The structure and function of the skeletal system

OCR

GCSE

This topic covers the structure and function of the skeletal system, including the location of major bones, the functions of the skeleton, types of synovial joints, and the movements possible at hinge and ball and socket joints.

Objectives

Exam Tips

Pitfalls

Key Terms

Mark Points

Topic Overview

The skeletal system is the framework of the body, consisting of 206 bones in an adult. It provides structure, protects vital organs, and enables movement through joints and muscle attachments. In OCR GCSE PE, you need to understand the major bones (e.g., cranium, vertebrae, femur), their functions (support, protection, movement, blood cell production, mineral storage), and how they work with muscles to produce movement. This topic is foundational for biomechanics and sports performance.

The skeleton is divided into the axial skeleton (skull, vertebral column, ribcage) and appendicular skeleton (limbs and girdles). Key functions include: support (holding body upright), protection (e.g., ribs protect heart/lungs, cranium protects brain), movement (bones act as levers), blood cell production (in bone marrow), and mineral storage (calcium and phosphorus). Understanding these functions helps you analyse how the skeleton contributes to athletic performance and injury prevention.

This topic links to joint types (hinge, ball-and-socket), antagonistic muscle pairs, and lever systems. For example, the femur acts as a lever during a kick, with the hip joint as the fulcrum. Mastering the skeletal system is essential for explaining how the body moves in activities like running, jumping, and throwing. It also connects to nutrition (calcium for bone health) and training (impact on bone density).

Key Concepts

Core ideas you must understand for this topic

→Axial vs appendicular skeleton: axial includes skull, vertebral column, ribcage; appendicular includes limbs, shoulder girdle, pelvic girdle.
→Five functions of the skeleton: support, protection, movement, blood cell production, mineral storage.
→Major bones: cranium, clavicle, scapula, humerus, radius, ulna, carpals, metacarpals, phalanges, sternum, ribs, vertebrae, pelvis, femur, patella, tibia, fibula, tarsals, metatarsals.
→Types of bones: long (e.g., femur), short (e.g., carpals), flat (e.g., cranium), irregular (e.g., vertebrae), sesamoid (e.g., patella).
→Joints: fixed (e.g., cranium), slightly movable (e.g., vertebrae), freely movable (e.g., knee, shoulder).

What You Need to Demonstrate

Key skills and knowledge for this topic

Naming and locating major bones: cranium, vertebrae, ribs, sternum, clavicle, scapula, pelvis, humerus, ulna, radius, carpals, metacarpals, phalanges, femur, patella, tibia, fibula, tarsals, metatarsals.
Functions of the skeleton: support, posture, protection, movement, blood cell production, storage of minerals.
Definition of a synovial joint.
Articulating bones of the knee (femur, tibia) and elbow (humerus, radius, ulna).
Articulating bones of the shoulder (humerus, scapula) and hip (pelvis, femur).
Movements at hinge joints: flexion and extension.
Movements at ball and socket joints: flexion, extension, abduction, adduction, rotation, circumduction.

Marking Points

Key points examiners look for in your answers

Naming and locating major bones: cranium, vertebrae, ribs, sternum, clavicle, scapula, pelvis, humerus, ulna, radius, carpals, metacarpals, phalanges, femur, patella, tibia, fibula, tarsals, metatarsals.
Functions of the skeleton: support, posture, protection, movement, blood cell production, storage of minerals.
Definition of a synovial joint.
Articulating bones of the knee (femur, tibia) and elbow (humerus, radius, ulna).
Articulating bones of the shoulder (humerus, scapula) and hip (pelvis, femur).
Movements at hinge joints: flexion and extension.
Movements at ball and socket joints: flexion, extension, abduction, adduction, rotation, circumduction.

Examiner Tips

Expert advice for maximising your marks

💡Use specific sporting examples to illustrate how the skeleton allows for movement or protection.
💡Ensure you can correctly identify the articulating bones for the four key joints: knee, elbow, shoulder, and hip.
💡Practice linking joint types to the specific movements they allow.
💡Use specific bone names in answers (e.g., 'humerus' not 'arm bone') to show precise knowledge.
💡Link functions to examples: e.g., 'The ribs protect the heart and lungs during a rugby tackle.'
💡For movement questions, identify the bone acting as a lever and the joint as the fulcrum. E.g., in a bicep curl, the radius is the lever, elbow is fulcrum.

Common Mistakes

Pitfalls to avoid in your exam answers

Confusing articulating bones at specific joints.
Failing to apply skeletal functions to specific sporting examples.
Incorrectly identifying the type of movement occurring at a joint during a specific phase of a sporting action.
Misconception: The skeleton is only for support. Correction: It also protects organs, enables movement, produces blood cells, and stores minerals.
Misconception: All bones are solid and hard. Correction: Bones have a hard outer layer (compact bone) and a spongy inner layer (cancellous bone) containing marrow.
Misconception: The patella is a long bone. Correction: It is a sesamoid bone, embedded in a tendon to protect the knee joint.

Frequently Asked Questions

Common questions students ask about this topic

Before You Start

Prior knowledge that will help with this topic

•Basic understanding of human body systems (e.g., muscular system).
•Knowledge of anatomical terms (e.g., anterior, posterior, superior, inferior).
•Familiarity with movement types (flexion, extension, abduction, adduction).

Likely Command Words

How questions on this topic are typically asked

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Practice questions tailored to this topic

The structure and function of the skeletal system

Topic Overview

Key Concepts

What You Need to Demonstrate

Marking Points

Examiner Tips

Common Mistakes

Frequently Asked Questions

Before You Start

Likely Command Words

Ready to test yourself?

Related Topics in OCR GCSE Physical Education

Aerobic and anaerobic exercise

Applied anatomy and physiology

Applying the principles of training

Characteristics of skilful movement

How to Revise The structure and function of the skeletal system — OCR GCSE Physical Education

Examiner Tips for The structure and function of the skeletal system

Common Mistakes in The structure and function of the skeletal system

Key Marking Points

The structure and function of the skeletal system

Topic Overview

Key Concepts

What You Need to Demonstrate

Marking Points

Examiner Tips

Common Mistakes

Frequently Asked Questions

What are the 5 main functions of the skeleton?

What is the difference between axial and appendicular skeleton?

How does the skeletal system help with movement?

What are the different types of bones and examples?

Why is the skeleton important for sport?

What bones make up the shoulder girdle?

Before You Start

Likely Command Words

Ready to test yourself?

Related Topics in OCR GCSE Physical Education

Aerobic and anaerobic exercise

Applied anatomy and physiology

Applying the principles of training

Characteristics of skilful movement