Your Skeletal System Explained
The human skeleton consists of 206 bones!
We are actually born with more bones (about 300), but many fuse together as we grow during childhood. At birth, many of our cranial bones are not yet fused and instead are joined by fibrous membranes called fontanelles. Fontanelles are the delicate “soft spot” on a baby’s head. Eventually, the fontanelles close as the bones grow together.
As an adult, our 206 bones that make up our skeletal system support our body and allow us to move. Bones store calcium, a mineral that helps bones stay strong. Calcium is needed for proper functioning for both nerves and muscles as well. Bones manufacture blood cells and store important minerals for the body.
The longest bone in our body is the femur (thigh bone). The smallest bone is the stirrup bone located inside the ear. Each hand has 26 bones in it. The nose and ears are not made of bone; they are made of cartilage, which is a flexible substance that is not as hard as bone.
Most of your bones have a dense and tough outer layer. Next is a layer of spongy bone, which is lighter and slightly flexible. In the middle of some bones is a jelly-like bone marrow. This is where new cells are being produced for blood
Roles of the Skeletal System
Levers
For motion and restriction of motion.
Support
The skeletal system is passive and can only move by muscular action such. Active systems (such as the muscular system) can only move with the support of the skeletal system.
Protection
The simplest example is the ribcage which provides protection for your internal organs such as the lungs and heart.
Storage
The spongy section of bone is composed of calcium, phosphate, and magnesium.
Blood Cell Formation
This takes place inside the bone marrow.
Structure and Function of Skeletal Bone
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