Question

The leg bones do not rub against each other when the knee moves back and forth while a person walks. Which among the following is responsible for it?

• A. Smooth muscle sheath
• B. Synovial fluid
• C. Articular cartilage
• D. Both b and c

Answer 1

The correct option is D Both b and c

A layer of smooth articular cartilage is present between the articular (adjoining) surfaces of the bones. Along with it, a clear, thick liquid is between the joints called synovial fluid. It lubricates the surfaces that glide past each other. Hence, it prevents the bones from rubbing against each other.
Smooth muscle is involuntary non-striated muscle.