SKELETAL SYSTEM
The skeletal system is the body’s solid framework — it’s what gives us shape, support, and strength. Without it, we’d simply collapse. But bones do more than just hold us up. They also protect vital organs, help us move, and even produce blood cells. It’s a system that works quietly in the background, keeping everything together and in motion.
BONES
Bones are the main building blocks of our skeleton. The average skeleton is made up of over 206 bones. There are natural variations: about one individual in 200 has
an extra rib.
JOINTS
Without joints, we’d be stuck in one position. Some joints let us bend and straighten (like elbows and knees), others allow rotation (like shoulders and hips), and some don’t move at all (like the joints in our skull). Joints allow us to walk, wave, sit, stretch, and twist — they’re essential for everyday motion.
CARTILAGE
LIGAMENTS
They’re hard, strong, and constantly being renewed by our body. They give us structure, allow us to stand upright, and protect our organs — like how the ribcage shields the heart and lungs or how the skull protects the brain.
But bones also work behind the scenes: inside many of them is bone marrow, which produces red and white blood cells that we need to carry oxygen and fight illness. They also serve as storage units, holding important minerals like calcium and phosphorus, which are released when our body needs them.
Joints are where two or more bones meet, and they give us our range of movement.
It acts as padding, helping bones glide over each other without friction and absorbing impact when we move, jump, or run. Cartilage also gives shape and structure to areas like our nose, ears, and windpipe, where flexibility matters.
Cartilage is a smooth, flexible tissue that covers the ends of bones where they meet in joints.
They help hold our joints together and keep them stable during movement. Without ligaments, our joints would be loose and prone to injury. They help control motion and prevent bones from moving too far or in the wrong direction.
Ligaments are strong, elastic bands of tissue that connect bones to other bones.
Skull
Spine
Chest
Arms
Hands
Pelvis
Legs
Feet
We start life with more bones than we end up with.
At birth, we have about 270 bones. As we grow, some of these bones gradually fuse together, especially in the skull and spine. By the time we reach adulthood, we typically have 206 bones. This natural fusing helps strengthen parts of the skeleton and gives our body a more stable structure as we develop.
Bones are stronger than they look.
Bone is an incredible material — lightweight but extremely strong. Ounce for ounce, bone can be stronger than steel, especially in terms of resisting pressure and stress. This strength allows our skeleton to support our entire body weight and withstand everyday impacts, all while staying light enough to let us move freely.
Bones are constantly renewing themselves.
Even though bones feel solid and unchanging, they are actually living tissue that goes through a process called remodelling. This means that old bone tissue is broken down and replaced with new tissue — a cycle that helps keep our skeleton healthy, adaptable, and strong throughout our lives. This also explains how we recover from fractures and adapt to physical stress, like exercise.
Things You Might Not Know
Bone strength peaks early — but maintenance lasts a lifetime.
We reach our peak bone mass (the point when our bones are the strongest and densest) in our late 20s to early 30s. After that, our bone density may naturally decline, especially if we’re inactive or not getting the nutrients we need. That’s why it’s so important to build strong bones early and keep them healthy with good nutrition, weight-bearing exercise, and regular movement as we age.
Name
Skeletal system
Consist of
Bones | Joints | Cartilage | Ligaments
Main function
The skeletal system provides structure and support for the body, protects vital organs, enables movement, and helps produce blood cells and store minerals
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