Skeletal SystemHESI A2 cheat sheet

206 bones and what they do

9 key facts 5 practice questions Reviewed Oct 2026

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Divisions

Axial — skull, vertebral column, ribs, sternum
Appendicular — limbs, shoulder and pelvic girdles

Functions

Support and protection of organs
Movement — levers for muscles
Hematopoiesis — blood cell formation in red marrow
Mineral storage — calcium and phosphorus

Bone Types

Long (femur), short (carpals), flat (sternum), irregular (vertebrae)

Structure

Compact bone outside, spongy bone inside
Osteoblasts build; osteoclasts break down

Key takeaway

206 bones and what they do

Before you read

Test yourself first: 5 questions

Question 1 of 5

Which organ system provides structure and protects internal organs?

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