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CLASS 7 · LEARNING KNOWLEDGE

Locomotor system – basic principles

How it works

The human locomotor system consists of the skeleton with bones and joints, as well as muscles, tendons and ligaments. The skeleton gives the body support and protects organs. Muscles enable movement by contracting and pulling on bones via tendons. Tendons connect muscles with bones. Ligaments connect bones with bones and stabilize the joints in particular. Joints allow mobility between bones. There are different types of joints (e.g. ball-and-socket and hinge joints). Bones consist of living tissue that can grow and renew itself. The cooperation of muscles, skeleton, tendons, ligaments and joints enables targeted movements. Poor posture or injuries can impair the function of the locomotor system.

Note
The locomotor system works through the interaction of skeleton, joints, ligaments, muscles and tendons: muscles contract, transmit the force to bones via tendons, and ligaments stabilize the movable connections of the bones in the joints.

An example

Which part of the skeleton protects the brain?

The brain is protected by the skull. The skull belongs to the skeleton and forms a hard bony shell around the brain.

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