Question

How many muscles work together to move a bone?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

The correct option is B

Two

The correct option is B:

Explanation of the correct option:

1. There are three types of muscle in humans:
   1. Skeletal muscle:
      • In the legs, arms, and face, skeletal muscle is linked to the bone via cord-like tendons.
      • It is also known as voluntary muscle.
   2. Smooth muscle:
      • Smooth, or involuntary, muscle is also made up of fibres, but it appears smooth rather than striated.
      • They're automatically controlled by the neural system.
   3. Cardiac muscle:
      • Cardiac muscle is a type of muscle found in the heart.
      • Muscle fibres make up the majority of the walls of the heart's chambers.
      • The heart muscle is also an involuntary muscle.
2. 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.

Explanation of the incorrect option:

Option A:

The movement of the bone is controlled by two muscles, not one muscle.

Option C:

The movement of the bone is controlled by two muscles, not three muscles.

Option D:

The movement of the bone is controlled by two muscles, not four muscles.

Final answer: Two muscles work together to move a bone.