The human skeletal system
Chapter 1
The living architecture of bone
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Chapter 2
The axial skeleton protecting the core
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Chapter 3
The appendicular skeleton designed for movement
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Chapter 4
The lifetime journey of bones
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Chapter 5
What bones leave behind
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YOUR GOAL
Master of The human skeletal system
Ch 4 · The lifetime journey of bones
teacher I'm fading out the old to build a brand new frame, Renewing every bone while staying just the same.
Fun Fact
Baby bones: Human babies are born with 270 bones, but they fuse together so seamlessly that adults end up with only 206 bones.
Glossary
ossification (noun)
The natural process of bone formation, in which cartilage or other tissue is transformed into bone. By age twenty-five, this process concludes as the human skeleton reaches its final, fully mature state.
The natural process of bone formation, in which cartilage or other tissue is transformed into bone. By age twenty-five, this process concludes as the human skeleton reaches its final, fully mature state.
Quiz
What is the biological process called where flexible cartilage is replaced by hard bone tissue?
Quiz
Which vitamin is essential for the human body to properly absorb calcium into the bones?
Quiz
Which bone-building cells are responsible for laying down new bone tissue during growth and repair?
Quiz
Approximately how many bones are human babies born with before many of them fuse together?
Quiz
What silent disease causes bones to lose density, become porous, and fracture easily?
Quiz
What is the name of the soft, temporary bridge made of cartilage that forms during bone healing?