Our bodies are complex working systems and most of us don't know anything about how they work. To simplify how they work and to give you real time live information, a very smart lady by the name of Lucann Colombo created books with real live images to educate people about the body and its parts. It is so educational, for both adults and children.
I've been helping people with their bodies for decades and I still keep learning from this. There is sooo much to know.
Bone Zone
Bones form the structure of your body. They allow you to stand, sit, run, play and twist yourself up like a pretzel. Without them, you'd be nothing but a big soft blob! Some bones, like your rib cage and pelvis, protect your internal organs. Muscles attached to your bones allow you to move. Bones manufacture blood cells and store fat and calcium, a mineral that keeps bones strong.
Bone Tissue
There are two kinds of bone tissue: compact bone and spongy bone. Compact bone tissue is rock-hard, because it's made of the same minerals found in rocks: calcium, phosphate and magnesium.
Spongy bone tissue contains collagen, which is a strong yet flexible material. Collagen makes bone strong by allowing them to bend slightly without breaking. A network of blood vessels carries minerals and other nutrients in and out of your bones.
We're all boneheads!
The twenty-nine bones of your skull form a strong, protective shell around your brain, eyes, and inner ear. Although your skull looks like one big bone, it is many pieces fused together by immovable joints called sutures. The part surrounding the bring is called the cranium. It is made up of eight interlocking cranial bones that enclose the brain and keep it from harm. Fourteen facial bones make up the framework for the eyes, nose, cheekbones and jawbone.
Jawbone
The jawbone is one of the most important bones of any animal. Without it, you couldn't chew your food and take in the nutrients you need to survive. The upper jaw, called the maxilla, is attached to the rest of the skull and can't move.
The lower jaw, called the mandible, is the only part of the skull that can move.
Try this!
Take a leg bone from a cooked chicken and clean it really well. Place the bone in a jar of vinegar and tightly close the jar. After 5 days, open the jar and gently try to bend the bone. The longer you leave it in the vinegar, the more rubbery it will become. That's because the vinegar is an acid that dissolves calcium in bones. Bones need calcium to be hard and not rubbery.
There is so much to know about the body. I suggest you get a copy of Luann Colombo's book. https://www.silverdolphinbooks.com/search/luann+colombo/.
As you can, calcium and magnesium are vital minerals the body needs - along with some others. You can order CalMag-C here: https://sunshinevitamins.com/collections/supplements