Multiple choice

The protein found in the bone which binds sodium is

  1. fibronectin

  2. laminins

  3. osteonectin

  4. selectins

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Osteonectin is a glycoprotein in the bone that binds sodium. It is secreted by osteoblasts during bone formation, initiating mineralization and promoting mineral crystal formation. Osteonectin also shows affinity for collagen in addition to bone mineral calcium.