Muscular/skeletal structure

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The skeleton is the framework for holding the body together, and the muscles and sinews are the main mechanism for moving it about using the flexible joints (knees, elbows, shoulders, ankles, etc.).

skeleton

Adults have 206 bones, with the hard matter being made up of calcium, phosphorus and magnesium.

The bone marrow inside many bones (especially in the hip and thigh) contains stem cells and is where red and white blood cells and platelet cells are manufactured.  Around 200 billion new red blood cells are created every day, replacing about 1% of the red blood cells in the body.