Final answer:
Spinal discs, composed of fibrocartilage, are situated between the vertebrae and allow for limited spinal movement while acting as shock absorbers and maintaining the spine's structural integrity. As people age, the inner part of the discs becomes less elastic, potentially decreasing shock absorption capacity.
Step-by-step explanation:
True: Spinal discs do allow for spinal movement.
Intervertebral discs are crucial for spinal mobility and overall back function. These discs are located between the vertebrae from the second cervical vertebra down to the sacrum. Each disc is a key component of a joint, affording the spine a limited range of motion. This movement is essential for daily activities and the absorption of shocks from walking, running, and other movements. Besides allowing motion, intervertebral discs serve as ligaments that hold the vertebral bodies together, maintaining structural integrity.
Comprising an outer layer of fibrocartilage called the anulus fibrosus and a gel-like center known as the nucleus pulposus, the discs function both as shock absorbers and as a form of cartilaginous joint known as a symphysis. This combination of features allows them to withstand the compressional forces exerted during everyday tasks while also maintaining the alignment and strength of the spine.
As we age, the nucleus pulposus tends to harden, losing some of its elasticity. Consequently, older individuals might experience a reduced ability of the intervertebral discs to cushion impacts effectively.