The body's internal structure is the Human skeleton.
This is made up of 300 bones at birth-this number falls by adulthood to 206 bones as certain bones have fused. In the skeleton, the bone mass reaches maximum density around age 30.
Bones are connected to other bones by long fibrous straps called ligaments.
Tendons connect muscle to bone.
Ligaments and Tendons both are made of collagen.
Many factors work together to ensure the strength and health of bones. Bone density relies on:
A steady supply of dietary calcium
Adequate vitamin D from sunshine and food
A healthy diet with plenty of vitamins and minerals
Various hormones including parathyroid hormone, growth hormone, calcitonin, oestrogen, and testosterone