Question

Why are the lumbar vertebrae the largest and strongest in the vertebral column?

Answer 1

Hint: The vertebral column is the structure that allows movement and maintains the upright position in humans. It is made of small irregular bones called vertebrae that are aligned in an interlocking sequence from the base of the skull to the pelvis down. The backbone is divided into many parts namely the cervical, thoracic, lumbar, sacrum, and coccyx. The lumbar vertebrae are made up of five individual cylindrical bones that form the spine in the lower back.

Complete answer:
The lumbar vertebrae are present along the body’s midline and in the lower back region. They are found between the thoracic vertebrae in the thorax and the sacrum and coccyx in the pelvis
It consists of an intervertebral disk made of tough fibrocartilage with a jelly-like centre. The outer layer of the intervertebral disk called the annulus fibrosus, holds the vertebrae together and provides strength and flexibility to the back during movement. The jelly-like centre also acts as a shock absorber to resist the strain and pressure exerted on the lower back.
The lumbar vertebrae are the largest and heaviest vertebrae in the spine. They grow in size as they progress down the spine to support the body's weight. It bears most of the body’s weight and allows certain movements, such as lifting objects. The lumbar bones also protect the spinal cord and nerves from injury and provide a measure of support.

Note:
The vertebrae are an important structure in vertebrates. They support the head, neck and the body. They provide attachment points for muscles and ligaments, allowing many of the motions such as bending and twisting. The vertebrae also protect the spinal cord from the risk of damage due to trauma and everyday activities. There is no blood supply to the intervertebral discs.