Question

NCERT CLASS 6 SCIENCE CHAPTER 8 BODY MOVEMENTS

Q. 1 Answer the following in brief.

1. What are two sets of muscles needed to a bone at a joint ?

Type answer in your words​​

Answer 1

Answer:

Generally, two skeletal muscles are joined to one bone, so that when one muscle contracts in one direction enabling the bone to move in that specific direction.

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Answer 2

Muscles pull on joints, which allows us to move. Any form of bone movement requires a pair of muscles. Even if we are sitting perfectly still, our muscles are constantly moving throughout our bodies.

Explanation:

• A bone's mobility is controlled by two muscles. The movement of the bone is controlled by two muscles: flexor and extensor. This is due to the fact that a muscle can only operate in one direction. It can only pull a bone back to itself, not push it.
• In the legs, arms, and face, skeletal muscle is linked to bone via cord-like tendons. Skeletal muscles are also known as striated muscles since they are made up of horizontally striped fibres that can be seen under a microscope.
• These muscles help to keep the skeleton together, give the body form, and help it move about. They contract swiftly and strongly, but they become fatigued soon.