Skeletal SYS

Skeletal SYS

by Djamala Goodwin

​YOUR BONES

• ​You were born with 300 bones

• ​Adults have 206

• ​Some bones fuse together as you grow

• ​Bones work with muscles for movement

• Bones help maintain homeostasis by storing minerals and making blood cells.

​Structures and Classifications of Bones

​composition of bones

• osteocytes–mature bone cells

• organization of bones 

(types of bone)

• Cortical: dense, hard, outer layer

• Trabecular: spongy, flexible, inner 

(porous like a honeycomb)

​Bone Growth & Remodeling

• ​osteoblasts 

  • build bone tissue

• osteoclasts

  • break down bone tissue

• bone formation

  • ossification

​Shape Categories of Bone

• ​​

• ​Long- cortical shafts, trabecular ends: ex legs and arms

• ​Short- cubed, mostly trabecular bone wrist, ankle

• ​Flat- large surface, two layers of cortical bone & 1 layer of trabecular, sternum

• ​Irregular- bones that don’t fit into other categories, Vertebrae& hips

​

Multiple Choice

What builds new bone

• Osteoclast

• Osteoblast

• Osteon

• Osteocytes

Multiple Choice

A mature bone cell

• osteocyte

• osteoblast

• ossification

• osteon

​The Human Skeleton

​bones bones bones...and more bones!!! Remember there are 206 of them!!

The END.

for now...​