Bones are hollow  filled with ___________.

An irregular bone.

An example  of short bone.

_________ is made up of adipose tissue and  blood vessels which give rise to  white blood cells.

_______are arranged  in the form of concentric rings.

The lumbar spine  has _________ vertebrae.

A bone put  in weak hydrochloric acid is called  decalcified bone because ___________.

There are  ____________thoracic vertebrae.

The neck region has seven ____________ vertebrae.

The vertebral or spinal column  is composed of  33  ring like  bones called __________.