What is the Skeletal System?

The skeletal system is the name for all the bones and joints that make up the internal structure of our body.  There are 206 bones in the human body. 

What are bones made of?

  • The outer layer of a bone is called the Periosteum. It is a thin, strong layer containing nerves and blood vessels which nourish the bone.
  • Compact Bone is the shiny white layer of bone that we imagine when we think of a skeleton. This layer gives the bone its strength and structure.
  • Cancellous Bone, also known as spongy bone, is the spongy-looking layer of bone underneath the Compact Bone. This is designed to be strong but light, so that we can move around easily.
  • Protected in the centre of some bones (such as the femur, or thigh bone), we can find Bone Marrow. This is where our body makes blood cells.

 

What do our bones do?

  • The skeleton is the scaffold for our bodies. It provides a stable, strong structure for our muscles to attach to, and gives us shape.
  • Muscles and bones act together so that we can move. They act as levers – for example when we lift things, or kick balls – without too much effort.
  • Our organs are protected by our skeleton. For example: the skull protects our brain, while the rib cage protects our heart and lungs.
  • Blood cells are produced deep inside flat bones (such as the skull or hip bones) and long bones (such as thigh or arm bones).
  • Essential minerals and substances are stored in our bones for use when needed. The most important of these is calcium.
  • Bones change and develop as we grow. When we are born, we have about 300 bones.  As we grow, some of them grow together (fuse).  Other ‘bones’ are made of a substance called ‘cartilage’ when we are born, and slowly absorb calcium and turn into adult bone as we grow up.  This process happens at a certain rate, and is completed by the time we are 25 years old.  This explains why archaeologists can sometimes tell how old a person was, just from their skeleton.
  • Bone cells release a hormone that regulates blood sugar and fat deposits.

What are joints?

The point of contact between two bones is called a joint.  We have several different types:

  • A Fixed joint doesn’t move at all. A flat plate in the skull fused to another plate is an example of a fixed joint.
  • A Synovial joint is the most common type in our body. The space where two bones meet is covered with a kind of capsule which holds liquid called synovial fluid. This fluid acts like oil to stop friction and allow the bones to move.
  • A ‘hinge joint’ is where the bones can only move in one direction, such as the elbow.
  • A ‘ball and socket’ joint can move in many directions. The shoulder and the hips are ball and socket joints.

Public Domain images courtesy of WPclipart.com

References:

KidsHealth.org, Your Bones, October 2012.  Retrieved from:

http://kidshealth.org/ 20 March 2015

InnerBody.com Skeletal System, n.d. Retrieved from: http://www.innerbody.com/image/skelfov.html  20 March 2015

With support from       JSB Education

LET NZ 20 March 2015

1. Who is the main person or group of people in this news article?

2. What was the key event from the news article?

3. Where did this event take place?

4. When did this event take place?

1. Find a quote from the main person in this news article?

2. In your own words describe what happened in this news article.

3. Find out where this event took place and include some information about this place.

4. Tell us when this event happened and explain what might happen in the future.

5. Explain in your own words why this event took place.

Current Events Web
Find the Who, What, Where, When, How and Why in the article to complete this worksheet.

I Think Because
Share what you think about the article and explain why.

My Questions
Write a question map about questions that you have after reading the article.

News Review
Give the news article you have read a review

KWL
Write what you KNOW about the topic in the article, what you would LIKE to find out and then what you have LEARNT.

Newspaper Bingo
Play newspaper bingo. Find a number of different articles to complete the grid.

Questions and Answers
Write a set of questions and then their answers after reading the article.

The Big Idea
Find the big idea by highlighting the 5 W’s and 1 H. then select 25 of key words associated with the article.

Word Investigation
Vocabulary exercise where students find key words within the article.

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