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Updated Mar 23, 2026
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GCSE PE: Comprehensive Notes on Skeleton and Muscle Movements
Pheebs
@phoebe1
1 / 4
Skeletal Structure and Bone Classification
Ever wondered why your body doesn't collapse like jelly? Your skeleton provides the rigid framework that keeps you upright and moving. Key bones include the humerus (upper arm), femur (thigh), tibia and fibula (lower leg), plus protective bones like the cranium and ribs.
Bones aren't all built the same way. Long bones like the humerus and femur act as levers for big movements. Short bones such as the talus in your ankle absorb shock when you land from jumps. Flat bones like your cranium and ribs form protective shields around vital organs.
Irregular bones like your vertebrae have unique shapes for specific jobs - in this case, protecting your spinal cord whilst allowing flexibility. Each bone type has evolved perfectly for its role in keeping you moving and protected.
Quick Tip: Remember "Long bones = levers, Flat bones = protection" to ace your exam questions about bone classification!
Skeleton Functions and Joint Movements
Your skeleton does way more than just hold you up - it's got six crucial jobs. Support and shape are obvious, but it also handles protection (ribs guard your lungs), movement (working with muscles), mineral storage, and blood cell production in bone marrow.
Joints are where bones meet, and the most important type for movement are synovial joints. These come in two main varieties: hinge joints (like your elbow and knee) that work like a door, and ball and socket joints (hip and shoulder) that allow movement in all directions.
Understanding joint movements is crucial for PE. Flexion decreases the angle between bones (bending your arm), whilst extension increases it (straightening your arm). Abduction moves limbs away from your body, adduction brings them back towards it.
Don't forget the ankle-specific movements: plantar flexion (pointing your toes down) and dorsi flexion (pulling toes towards your shin). Your shoulder can do circumduction - that circular windmill motion.
Exam Winner: Each joint has specific movements it can perform - shoulders are the most flexible, ankles have their own special terms!
Major Muscle Groups and Antagonistic Pairs
Your muscles are the engines that power every sporting action. Key muscles you need to know include the deltoids (shoulders), pectorals (chest), biceps and triceps (arms), quadriceps and hamstrings (thighs), plus your gluteals (bum muscles) and gastrocnemius (calf).
Here's the clever bit: muscles can't push, only pull. That's why they work in antagonistic pairs - whilst one muscle contracts (the agonist or prime mover), its partner relaxes (the antagonist) to allow smooth movement.
Take bending your arm at the elbow. Your biceps contracts to pull your forearm up whilst your triceps relaxes to allow the movement. When you straighten your arm, the roles reverse - triceps contracts, biceps relaxes.
This partnership system happens throughout your body and is essential for controlled, coordinated movement in all sports.
Remember This: Muscles work in pairs because they can only pull, never push - one contracts whilst the other relaxes!
Types of Muscle Contractions in Sport
Not all muscle contractions create movement - and understanding this difference will boost your exam marks. Isometric contractions occur when muscles contract but don't change length, creating no movement. Think holding a handstand or the static phase of tug-of-war.
Isotonic contractions involve movement and come in two types. Concentric contractions happen when muscles shorten whilst contracting - like the upward phase of a press-up or bicep curl. Eccentric contractions occur when muscles lengthen whilst still contracting - controlling the downward phase of movements.
Eccentric contractions are brilliant for control and preventing injury. When you lower yourself in a squat, your quadriceps are working eccentrically to control the descent. In a football throw-in, your triceps work concentrically to extend your arms and release the ball.
Understanding these contraction types helps you analyse any sporting movement and explains why the lowering phase of exercises often feels harder than lifting!
Sport Connection: Every athletic skill uses different contraction types - analysing these patterns is key to improving performance and preventing injury!
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
GCSE PE: Comprehensive Notes on Skeleton and Muscle Movements
Pheebs
@phoebe1
Your skeletal and muscular systems work together to create every movement you make, from texting on your phone to scoring goals in football. Understanding how bones, joints, and muscles coordinate is essential for GCSE PE and helps you appreciate the... Show more
Skeletal Structure and Bone Classification
Ever wondered why your body doesn't collapse like jelly? Your skeleton provides the rigid framework that keeps you upright and moving. Key bones include the humerus (upper arm), femur (thigh), tibia and fibula (lower leg), plus protective bones like the cranium and ribs.
Bones aren't all built the same way. Long bones like the humerus and femur act as levers for big movements. Short bones such as the talus in your ankle absorb shock when you land from jumps. Flat bones like your cranium and ribs form protective shields around vital organs.
Irregular bones like your vertebrae have unique shapes for specific jobs - in this case, protecting your spinal cord whilst allowing flexibility. Each bone type has evolved perfectly for its role in keeping you moving and protected.
Quick Tip: Remember "Long bones = levers, Flat bones = protection" to ace your exam questions about bone classification!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Skeleton Functions and Joint Movements
Your skeleton does way more than just hold you up - it's got six crucial jobs. Support and shape are obvious, but it also handles protection (ribs guard your lungs), movement (working with muscles), mineral storage, and blood cell production in bone marrow.
Joints are where bones meet, and the most important type for movement are synovial joints. These come in two main varieties: hinge joints (like your elbow and knee) that work like a door, and ball and socket joints (hip and shoulder) that allow movement in all directions.
Understanding joint movements is crucial for PE. Flexion decreases the angle between bones (bending your arm), whilst extension increases it (straightening your arm). Abduction moves limbs away from your body, adduction brings them back towards it.
Don't forget the ankle-specific movements: plantar flexion (pointing your toes down) and dorsi flexion (pulling toes towards your shin). Your shoulder can do circumduction - that circular windmill motion.
Exam Winner: Each joint has specific movements it can perform - shoulders are the most flexible, ankles have their own special terms!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Major Muscle Groups and Antagonistic Pairs
Your muscles are the engines that power every sporting action. Key muscles you need to know include the deltoids (shoulders), pectorals (chest), biceps and triceps (arms), quadriceps and hamstrings (thighs), plus your gluteals (bum muscles) and gastrocnemius (calf).
Here's the clever bit: muscles can't push, only pull. That's why they work in antagonistic pairs - whilst one muscle contracts (the agonist or prime mover), its partner relaxes (the antagonist) to allow smooth movement.
Take bending your arm at the elbow. Your biceps contracts to pull your forearm up whilst your triceps relaxes to allow the movement. When you straighten your arm, the roles reverse - triceps contracts, biceps relaxes.
This partnership system happens throughout your body and is essential for controlled, coordinated movement in all sports.
Remember This: Muscles work in pairs because they can only pull, never push - one contracts whilst the other relaxes!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Types of Muscle Contractions in Sport
Not all muscle contractions create movement - and understanding this difference will boost your exam marks. Isometric contractions occur when muscles contract but don't change length, creating no movement. Think holding a handstand or the static phase of tug-of-war.
Isotonic contractions involve movement and come in two types. Concentric contractions happen when muscles shorten whilst contracting - like the upward phase of a press-up or bicep curl. Eccentric contractions occur when muscles lengthen whilst still contracting - controlling the downward phase of movements.
Eccentric contractions are brilliant for control and preventing injury. When you lower yourself in a squat, your quadriceps are working eccentrically to control the descent. In a football throw-in, your triceps work concentrically to extend your arms and release the ball.
Understanding these contraction types helps you analyse any sporting movement and explains why the lowering phase of exercises often feels harder than lifting!
Sport Connection: Every athletic skill uses different contraction types - analysing these patterns is key to improving performance and preventing injury!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content: Skeletal System
Most popular content in Physical Education
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user