Slide 1 - Skeletal System Notes

Slide 2 - Your body has two organ systems that work together to provide support & help you move– the skeletal system & the muscular system.

Slide 3 - The skeletal system is made up of bones & cartilage that form the framework of your body.

Slide 4 - The muscular system includes the muscles that help you move & help things inside your body move.

Slide 5 - All humans have a stiff internal skeleton made of bone.

Slide 6 - The bones of your body have five main jobs–

Slide 7 - -to support the body & give it shape

Slide 8 - -to protect internal organs

• -to work with the muscles to move

Slide 9 - -to store fat & other minerals (calcium & phosphorus)

Slide 10 - -to make blood cells (bone marrow)

Slide 11 - A human baby is born with 350 bones, but an adult human has 206 bones.

Slide 12 - Bones are made up of mostly calcium & phosphorus.

Slide 13

• Bones are very much alive & contain blood vessels & nerve tissue.

Slide 15 - Cartilage is a strong flexible connective tissue found at end of bones where they act as a cushion.

Slide 16 - Cartilage has no blood cells so it must absorb nutrients from body fluids. (diffusion)

Slide 17 - Bones are attached to other bones by connective tissues called ligaments.

Slide 18 - A joint is the place where two bones come together & are joined by ligaments to allow bones to move in different ways.

Slide 19 - Two types of joints in the body…

Slide 20 - Immovable joints allow little or no movement (skull & ribs)

Slide 21 - Movable joints that allow a wide range of movement.

Slide 22 - Pivot joint

• Bones rotate around each other (allows side-to-side motion)

Slide 23 - Examples…

• Neck

Slide 24 - Gliding joint

• Bones slide over each other (allows you to bend & flex)

Slide 25 - Examples…

• Wrist, ankle, vertebrae (back)

Slide 26 - Hinge joint

• Back-and-forth motion (can only move one direction… unable to twist)

Slide 27 - Examples…

• Knee, elbow, fingers, toes, jaw

Slide 28 - Ball & socket joint

• Rotational or circular motion… greatest range of motion

Slide 29 - Examples…

• Shoulder, hip

Slide 30 - The best way to keep your bone healthy are regular exercise & to eat a balanced diet with meats, beans, green leafy vegetables & dairy products.

Slide 31 - Osteoporosis is the condition where mineral loss can cause bones to become weak & break easily.