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World 13 · Structure, sections & movement · 6 min · PRO

Inside a long-bone shaft

At a section height between 40% and 60%, record cortical bone and the medullary cavity.

PRO · Human Body

World 13: Structure, sections & movement is part of PRO

The first world of Human Body is free. PRO opens the other 119 lessons in 17 worlds — simulations, quizzes and all.

  • Assemble the key bones
  • Open four heart chambers
  • Trace the double circulation
  • An antagonistic muscle pair
  • Read an upper-arm section
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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← Read an upper-arm sectionBoyle’s law in the chest →

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