The skeletal system is the framework of the body, made up of bones, cartilage, ligaments, and joints. It provides structure, protection, support, and enables movement through its connection to the muscular system.
🧬 Main Functions of the Skeletal System
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Support – Provides shape and structural support for the body.
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Protection – Protects vital organs (e.g., the skull protects the brain, the rib cage protects the heart and lungs).
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Movement – Works with muscles to enable body movement.
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Mineral storage – Stores essential minerals such as calcium and phosphorus.
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Blood cell production – The bone marrow produces red and white blood cells (hematopoiesis).
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Energy storage – Yellow bone marrow stores fat as an energy reserve.
🦵 Major Components
| Part | Description |
|---|---|
| Bones | Hard, dense structures that form the skeleton. Adults have 206 bones. |
| Cartilage | Flexible, rubbery tissue that cushions joints and forms parts like the nose and ears. |
| Ligaments | Strong, fibrous bands that connect bones to other bones. |
| Joints | Where two or more bones meet, allowing movement (e.g., knee, elbow). |
| Tendons | Though part of the muscular system, they connect muscles to bones. |
🧱 Types of Bones
| Type | Examples |
|---|---|
| Long bones | Femur, humerus |
| Short bones | Carpals (wrist), tarsals (ankle) |
| Flat bones | Skull, ribs, scapula |
| Irregular bones | Vertebrae, pelvic bones |
| Sesamoid bones | Patella (knee cap) |
🔗 Types of Joints
| Joint Type | Movement | Examples |
|---|---|---|
| Fixed (fibrous) | No movement | Skull bones |
| Slightly movable (cartilaginous) | Limited movement | Spine (vertebrae) |
| Freely movable (synovial) | Full range of movement | Knee, elbow, shoulder |
⚠️ Common Diseases and Disorders
| Condition | Description |
|---|---|
| Osteoporosis | Bones become weak and brittle due to loss of bone density. |
| Arthritis | Inflammation of the joints causing pain and stiffness. |
| Fractures | Broken bones due to trauma or stress. |
| Scoliosis | Abnormal curvature of the spine. |
| Rickets | Softening of bones in children due to vitamin D deficiency. |
🥦 Bone Health Tips
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Eat foods rich in calcium and vitamin D (e.g., dairy, leafy greens, sunlight).
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Do weight-bearing exercises (e.g., walking, lifting weights).
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Avoid smoking and excessive alcohol.
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Get regular bone density tests if at risk of osteoporosis.