Skeletal System Intro I
- 1. The Skeletal SystemThe Skeletal System In this slideshow, you will learnIn this slideshow, you will learn about theabout the 5 functions5 functions of bone,of bone, and theand the 44 formsforms of bone in theof bone in the human body.human body.
- 2. Deep in our body, underneathDeep in our body, underneath our skin, muscles, and organs,our skin, muscles, and organs, there are bones.there are bones. In each human body there areIn each human body there are approximately 206 bonesapproximately 206 bones.. The exact number varies fromThe exact number varies from person to person, and alsoperson to person, and also depends on the person’s age.depends on the person’s age.
- 3. Each bone in a living body is anEach bone in a living body is an organ, made of a collection oforgan, made of a collection of different types of tissues. Some ofdifferent types of tissues. Some of the tissues are rigid (hard) andthe tissues are rigid (hard) and some of them are elastic (flexible),some of them are elastic (flexible), making bone both strongmaking bone both strong and durable.and durable.
- 4. Bone has fascinated humans sinceBone has fascinated humans since the beginning of time, probablythe beginning of time, probably because it is the part of us that canbecause it is the part of us that can last many, many yearslast many, many years past our death.past our death.
- 5. Artist Leonardo DaVinci made these drawings in the early 1500s. (Notice that he was left-handed and wrote in “mirror” style, backwards from right to left.)
- 6. In some European churches, there are entire chapels built of human bones, called ossuaries. These are most common in places were land was too important or scarce to use it for cemetaries. So people were buried for 1-3 years, then then their bones were dug up and added to the collection
- 7. The Skeletal System:The Skeletal System: FunctionsFunctions
- 8. 1. Support1. Support •The skeleton is the supporting framework for the body •All softer tissues hang off this frame
- 9. 2. Protection2. Protection • Bony “boxes” and “cages” protect delicate structures For example: The skull protects the brain and the rib cage protects the heart and lungs.
- 10. 3. Movement3. Movement • Muscles are attached to bones. As muscles contract and shorten, they pull on bones and move them.
- 11. 4. Storage4. Storage • Bones are important in maintaining homeostasis of blood calcium. (Calcium is needed for normal nerve and muscle function) • Bones are our calcium “bank”.
- 12. 5. Hemopoiesis5. Hemopoiesis • This word describes the process of making new blood cells (hemo = “blood”) • Blood cells are made in the red bone marrow inside some of our bones
- 13. The Skeletal System:The Skeletal System: FormsForms
- 14. There are four types of bones:
- 15. 1. Long Bones1. Long Bones These are longer than they are wide. Example: The humerus (upper arm bone), or femur (thigh bone)
- 16. 2. Short Bones2. Short Bones These are little boxy bones that are sort of square. Example: The carpals, or wrist bones.
- 17. 3. Flat Bones3. Flat Bones These are plate-like bones. Examples: The frontal bone at the front of the skull, or the scapula (shoulder blade) below.
- 18. 4. Irregular Bones4. Irregular Bones These are a very uneven shape with lots of bumps, holes, etc. Example: The vertebrae, or bones of the spine.
- 19. Did you know that the mostDid you know that the most musical bone is a trom-bone?musical bone is a trom-bone?
- 20. Did you find my joke humerus? The End.The End.