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Walk-In. Where can you find skeletal muscles? Smooth muscles? Cardiac muscles? What is another name for skeletal muscles? Smooth muscles? Homework Project due MONDAY. Yesterday’s Lab due NOW. The Skeletal System. Did you know?. The human hand has 19 bones but your face only has 14.

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Walk-In

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  1. Walk-In • Where can you find skeletal muscles? Smooth muscles? Cardiac muscles? • What is another name for skeletal muscles? Smooth muscles? • Homework Project due MONDAY. • Yesterday’s Lab due NOW.

  2. The Skeletal System

  3. Did you know? • The human hand has 19 bones but your face only has 14. • Although bones seem really hard, they are ¾ water which makes them spongy. • The longest bone in your body is your thigh bone (the femur). It's about 1/4 of your height. • The smallest bone is the stirrup bone in the ear which can measure 1/10 of an inch. • Did you know that humans and giraffes have the same number of bones in their necks? Giraffe neck vertebrae are just much, much longer! • You have over 230 moveable and semi-moveable joints in your body.

  4. Skeletal System • Functions: Supports the body, gives it shape, protects organs, attachment for muscles. • Bones are alive – growing and changing. • Calcium is the major part or component of bone tissue. • You are born with about 350 bones in your body. • The average person has 206 bones in their body. • The number is not exact because some people have an extra pair of ribs or more bones in their hands and feet.

  5. Why didn’t the skeleton cross the road?

  6. Because it didn’t have the guts!

  7. Medical Names for Bones • Ankle: tarsal • Hipbone: pelvis • Skull: cranium • Wrist: carpal • Collarbone: clavicle • Kneecap: patella • Shoulder blade: scapula • Backbone: vertebrae

  8. More medical terms!Read this slide… Each common bone in the body has a medical name!

  9. Four Different Types of Bones • Long bones: arm, leg, hand, feet • Short bones: wrist, ankle, • Flat bones: skull, ribs, chest • Irregular shaped bones: spine, face

  10. Parts of a Bone • Periosteum: active, living membrane that covers a bone. When a bone breaks, the periosteum cells multiply and grow over the break. • Compact Bone: hard outer surface; hardest part of the bone • Spongy Bone: very porous (lots of holes); nerves and blood vessels are found in the spongy bone • Marrow: middle or center of bone; helps manufacture or make blood cells.

  11. Joints

  12. Kinds of Joints • A jointis where 2 or more bones meet. • Allow wide range of motion like twisting and bending. • Joints are padded with a rubbery tissue called cartilage. • Nobody knows why joints crack. It may be from tiny air bubbles that form in the joint, or from a tight tendon and ligament snapping over a bone when moving. • Cracking your joints on purpose can damage the joint surface.

  13. Hinge Joint: allows the knee, knuckle, elbow, ankle, finger, & toe to bend. Gliding or Sliding Joint: allows the wrist and spine to twist and bend. Ball & Socket Joint: allows the hip & shoulder to swivel. Pivot Joint: allows the elbow and neck to twist. Brainpop: Joint RMA

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