how do the muscles help in moving the bones?
Bones don't work alone and they need help from the muscles and joints. Muscles pull on the joints, allowing us to move.
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but can't push them back to their original position. That is why they work in pairs of flexors and extensors.
For example, the biceps muscle is a flexor, and the triceps is an extensor.
- To lift the forearm, the biceps contracts and the triceps relaxes.
- To lower the forearm, the triceps contracts and the biceps relaxes.
The arm is flexed by the contraction of the biceps muscle. The triceps muscle relaxes as the biceps contracts and the arm bends at the elbow. The biceps muscle becomes thicker and shorter as the arm bends at the elbow joint.
Musclesare necessary for movement: They're the masses of tough, elastic tissue that pull our bones when we move.
If You are asking for homework, the answer is:
Movements of bones occur only at the joints. The movements are brought about by contractions of skeletal muscles inserted onto the articulating bones by firm cords of white fibrous tissue calledtendons.Cords of yellow elastic tissue, termedligaments,stabilise the joints by holding the articulating bones together.
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The muscles in the body provide the means of all movements. When stimulated by a nerve, the muscle contracts to become shorter and thicker and thus it pulls the bone at the movable end. Most actions in our body like standing, walking, running, playing etc. require combined action of several muscles. Movements of different parts of the body are usually made easier due to leverage actions in the skeleton. Functioning of all the three types of levers can be observed in the human skeleton.(a) (b)n
A muscle expands when it relaxes.The muscles in our bodies are attached to bones.They help the bones move,much like strings help a puppet move.But muscles can pull in only one direction.They cannot push.Each bone is usually attached to a pair of muscles.While one muscle pulls and contracts,it's partner relaxes.