Download The Skeletal System

The Skeletal
System
No bones about it!
5 Functions of the Skeletal
System…
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Provides shape and supports for body
Allows for movement
Protects internal organs
Stores materials (calcium and lipids)
Blood cell production (bone marrow)
The skeletal system is made up of:
Bone and the joints that connect them
together
Bone: Type of connective tissue that is hard
and calcified
Joint: a place where two or more bones
come together (can be moveable or
immoveable)
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Major Types of Joints
Major Types
of Moveable
Joints:
Immoveable/Fixed Joints…
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Example: skull, pelvis
How many bones are there in the
adult human?
206
But… humans are born with >270
bones and some fuse together as an
infant to become 206 bones.
The Human
Skeleton
-Major Bones
The Human
Skeleton
-Major Bones
Two Main Types of Bone:
Compact Bone – Solid, dense. Contains
blood vessels and nerves. Strong, stores
calcium.
 Spongy Bone – Numerous spaces and
cavities, lightweight.
*both can contain bone marrow.
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Red Bone Marrow – produces blood cells (red blood cells, white blood
cells, and platelets).
Yellow Bone Marrow – stores fats (lipids)
Long Bone
Other materials associated with
skeletal system:
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Cartilage: Soft connective tissue. Some
develops into bone after birth. Some remains
(nose, ears). Bones have cartilage at the ends
where they meet a moveable joint
Ligaments: connective tissue that connects
bone to bone
Tendons: connective tissue that connects
muscle to bone (allows for movement)
Cool Bone Videos…
 Skeletal
System Rap
 Human Skeletal System
 The Bone Dance
 Name Those Bones
by Zac Lewis
Fun Skeletal System Facts:
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You were born without a patella
Humans and giraffes have the same number of bones in their neck
The longest bone in your body is your femur
The smallest bone in your body is the stapes, also called the stirrup (hardly
larger than a grain of rice)
The largest bone is the pelvis, which is made of 6 bones firmly joined
together
The only bone not connected to another is the hyoid, at the base of the
tongue
There are 26 bones in the foot
The skeleton had a lot more cartilage when born, to be softer and allow for
an easier birth. Then the cartilage hardens and forms bone.
You are born will all red bone marrow (produces blood cells), but with age,
about half of it turns to yellow bone marrow (stores fats)