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. Stapes: located in the ear
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? Bone Marrow Red blood cells White blood cells
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
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