They pull on bones by contracting.
Your muscles pull on bones but they never push bones.
Muscles contract and relax to pull/push
Muscles never "push"; they can only "pull".The only power that muscles have is to contract or relax. When they contract, they pull. Most bones have two or more sets of muscles, and each muscle pulls in one direction; in sets, the muscles can work together or oppose each other, which account for all the actions that an animal or person can perform.
They pull on bones through tendons.
In order to move, muscles pull on the joints to pull the bones and let them move.
Muscles work by contracting not extending. Thus the mechanics of a body powered by muscles needs to work with that property. Muscle groups are therefore paired, on to pull a lever one way on one side of the hinge and another to pull the other way on the other side.
Muscles attached to bones contract and generate force, pulling on the bones they are attached to. This force causes the bones to move, resulting in movement of the body. The attachment of muscles to bones via tendons allows for efficient transfer of force and movement.
You flex your muscles to do this and these pull on the tendons which link the muscles to the bones.
all of them, muscles can only contract and relax
The muscles in your leg work against eachother.One contracts and one relaxes to push and pull the bones.
Muscles in the human body function by contracting and relaxing to create movement. They can only pull on bones, not push them. When a muscle contracts, it pulls on the attached bones, causing movement at the joints. Antagonistic muscles work in pairs, with one muscle contracting while the other relaxes to create movement in opposite directions.
Muscles pull. They have the capability of either contracting, or relaxing. They get longer when they relax but they do not exert any force by getting longer, since they are very flexible objects, not stiff rods. They only exert force when they contract, and the force they exert can be described as pulling. Muscles work in pairs, so that a joint can both bend and unbend, depending upon which muscle is pulling on it.