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Skeletal Systems


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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

The skeleton
Our skeleton is made of more than 200 bones. Calcium and other minerals make the bone strong but slightly flexible. Bone is a living tissue with a blood supply. It is constantly being dissolved and formed, and it can repair itself if a bone is broken.

The main functions of the skeleton are:
1. support the body
2. protect some of the vital organs of the body
3. help the body move
4. make blood cells

The Skeletal System
Basic components and functions of the skeletal system.
What are ligaments, tendons, and cartilage?



Tendons vs. Ligaments - What's the Difference?
Tendon joins muscle to bone enabling movement.
Ligament joins bone to bone, stabilising the joint.
Antagonistic muscle pair
Muscles can only pull and cannot push. In order to move a joint muscles work in pairs, called antagonistic muscles.
For example, your elbow joint has two muscles that move your forearm up or down. These are the biceps on the front of the upper arm and the triceps on the back of the upper arm.
To raise the forearm: the biceps contracts and the triceps relaxes
To lower the forearm again, the triceps contracts and the biceps relaxes

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