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Lower Elementary Science
2.13 The Skeletal System
: The heart and lungs have the protective armor called _____
: ______ is a series of fused bones, that acts like a hard protective helmet for your brain.
: What is the longest bone in your body?
the stirrup in the ear
thigh bone or the femur
: Like other cells in your body, the bone cells rely on blood to keep them alive. Blood brings them food and oxygen and takes away waste.
: When you were born you had over 300 bones. As you grew, some of these bones began to fuse together. So, an adult has only 206 bones.
: Many bones are hollow. Their hollowness makes bones strong and light. Bone marrow present in the center of many bones makes ________.
: _____ provides the structure which enables you to stand erect instead of lying like a puddle on the floor.
: ____ system forms the shape or the body, and protects the internal organs. It works closely with the muscular system to allow us to move.
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