The Skeletal System No bones about it!.

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The Skeletal System.

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Presentation transcript:

The Skeletal System No bones about it!

5 Functions of the Skeletal System… 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)

Major Types of Joints

Major Types of Moveable Joints:

Immoveable/Fixed Joints… 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. 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: 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)

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Fun Skeletal System Facts: 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)