Which of these is not a function of the vertebral column?

The presence of what makes the matrix of bones hard?

Identify the bone.

What is the central hollow portion of each vertebra known as?

Which of these is not a property of muscles?

Which of these is not a symptom of myasthenia gravis?

Which organelle is abundant in white fibres of muscles?

Which of these are the point of contact between bones and cartilage?