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Skeletal System. Fun Facts A giraffe has the same # of bones in the neck as humans do Bones are 14% of your body weight Bone is 5x as strong as steel.

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Presentation on theme: "Skeletal System. Fun Facts A giraffe has the same # of bones in the neck as humans do Bones are 14% of your body weight Bone is 5x as strong as steel."— Presentation transcript:

1 Skeletal System

2 Fun Facts A giraffe has the same # of bones in the neck as humans do Bones are 14% of your body weight Bone is 5x as strong as steel Most women and girls have smaller and lighter skeletons than men and boys The female pelvis is wider than males Male’s growth plates harden at years of age Female’s growth plates harden at years of age

3 How many bones does an adult body have? 206 How many bones are babies born with? 300

4 Why? As you grow older, small bones join or fuse together to make big ones.

5 Largest bone? Femur: thigh bone

6 Shortest Bone? Stapes: located in the ear

7 What are the functions of the skeletal system?

8 Skeletal System Functions: Support framework of the body Protection of vital organs Aid muscular system in movement of body Production of blood cells

9 What’s in a bone? 1.Bone Marrow 2.Red blood cells 3.White blood cells 4.Platelets

10 Bone Marrow Bone marrow is the soft spongy tissue that lies within the hollow interior of long bones Two types of bone marrow: red and yellow

11 Certain diseases of the bone marrow like leukemia, anemia, etc. require examination of the bone marrow tissue This is called a bone marrow biopsy A needle is used to withdraw samples of the marrow from within the bone This is often a very painful process

12 Red Blood Cells Shaped like disks Contain an iron-rich protein called hemoglobin Hemoglobin picks up oxygen in the lungs Hemoglobin releases oxygen to tissues as blood travels throughout the body Contains more red blood cells than any other cells (lifespan of 4 months)

13 White Blood Cells Key part in defending against disease Move in and out of bloodstream to reach affected tissues Fight germs such as bacteria and viruses Produce antibodies

14 Platelets Tiny, oval shaped cells Help in clotting process When a blood vessel breaks, they travel to the area and “seal” off the leak Last approximately 9 days


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