Bone is 70% inorganic mineral (such as calcium- and phosphate-containing hydroxyapatite) and 30% organic i.e. collagen. The inorganic component gives it its rigidity and strength, while the organic component gives it enough flexibility to prevent shattering. Bones have special cells that build the bone matrix while at the same time dissolve it. The balance of these opposing actions determine bone volume. The bone-building cells are osteoblasts while the bone-dissolving cells are osteoclasts.
Osteoblasts grow bone by secreting the inorganic minerals. Osteoclasts break it down by resorption using acid and an enzyme that breaks down collagen – collagenase.
The roulade-like part of the bone is the building block of bone called an osteon or Harvesian system. It contains the bone components, both inorganic and organic, and has connecting channels called canaliculi so cells can communicate with a central canal containing blood vessels and nerves. The canal is called the Harvesian canal.
This rolling arrangement enables the deposition of mineral in a way that achieves the bone matrix function of conferring strength.
Just a huge thank you for spending your time helping others. I love your site and I'm seriously very grateful. No word of a lie
Neuron13 The Student Room
Thank you for the help, your website and videos are awesome
pika mart YouTube
OFF TOPIC : I just want to say that your website is brilliant, thank you!!
I’ve struggled so much with feeling overwhelmed with biology revision, and I don’t know where to start. But your website is just what I need! It tells me all the information I need, and the knowledge I need to then build on, and it’s written in a way that soaks straight up into my brain!
Prettyhetty The Student Room
Thank you!! Your site is so helpful!