Skeletal System BonesJoints Connecting Tissue

Trivia Question Who has more bones?

Answer…..

Babies vs. Adults Babies = 300 bones Adults = 206 bones

Bones: Living or Dead? Living!!! –Living tissue composed of cells. –Bone cells need food and oxygen to grow, strengthen, work, and repair themselves.

Importance of Skeletal System? Movement –Provide points of attachment for muscles. Our body can only move because our muscles pull on our bones, which then moves our body.

Importance of Skeletal System… Support –Vertebrae Supports your head and upper body and protects your spinal cord Without your skeletal your body would collapse into a heap on the floor.

Importance of Skeletal System… Protection –Bones of skull protect brain –Ribs protect heart and lungs from injury

Importance of Skeletal System… Blood Cell Formation –Provide red and white blood cells Marrow is the tissue that produces these cells inside the center of the bone

Importance of Skeletal System… Storage –Bones store minerals (calcium, phosphorus) for use when needed by your body.

What are Joints? They are where bones come together.

Joints Hinge Joints –Elbows and Knees Moves in only one direction

Joints Gliding Joints –Wrists and ankles –Enable bones to slide over one another –Not great range of motion

Joints Pivot Joints –Between neck and head –Moves from side-to-side and up and down –Rotates on an axis (off your neck) –Limited range of motion to the side

Joints Ball-and-socket Joints –Hips and shoulders –Move in all directions –Shoulder has greatest range of motion –Bone fits in tight and secure into socket –Extremely painful when dislocated

Ball and Socket Joint

“Connectors” in the Body Cartilage Ligaments Tendons

Connectors Cartilage –Tough, flexible tissue similar to bone. Acts as a cushion between bones at a joint and protects the bones. Prevents the bones from rubbing together and wearing down the bone. Between your vertebrae there is cartilage. Knee contains cartilage. Nose and ears made of cartilage.

Cartilage Why are our nose and ears made of cartilage instead of bones?

Connectors in the Body Ligaments –Strong cords of tissue that connect bones at the joints. –They hold the bones in place!

Connectors in the Body Tendons –Tough bands of tissue that attach your muscles to bones (Achilles tendon)

LOOK AWAY IF YOU DON’T WANT TO SEE BLOODY STUFF!!!

How Do I Prevent This?!!??!? Warning: LOOK AWAY if you don’t like gross stuff.

OUCH!!!!!!!

Keeping Your Bones Healthy They need regular exercise to stay as strong as possible. Drink milk and other dairy products (low-fat cheese, frozen yogurt, and ice cream). –Contain calcium which helps bones harden and become strong.

Bones of the Body Take out your yellow diagram sheet

Questions?????