What are muscles and how do they work?
Last week we explored skeletons and different movable joints in the body, but how is it possible for us to make movements? Today we will find out.
Tissue: A living tissue is made from a group of cells with a similar structure and function, which all work together to do a particular job. Muscles are an example of a tissue.
Tendons: Tendons are a type of tissue that connects muscle to bone.
Involuntary movement: Activity that is not under our control.
Drawing of an arm showing tendons, bones and muscles.
Muscles are attached to bones by tendons and help them to move.
When a muscle contracts (bunches up), it gets shorter and so pulls on the bone it is attached to. When a muscle relaxes, it goes back to its normal size.
Muscles can only pull and cannot push. Therefore muscles have to work in pairs to move a joint. One muscle will contract and pull a joint one way and another muscle will contract and pull it the other.
Watch the following videos to find out more.
Have you ever wondered how some muscles grow?
Watch this video to find out the three main elements to growing muscles.
Questions related to this video
What are the three different types of muscles?
How many different muscle do we have in our bodies?
Can you name the involuntary muscles in the body?
What three things do you need to do to grow your muscles?
Task - Make a muscle
Follow the instructions below to make a muscle. You may have to be creative with the things that you use to make it. For example, reusing split pins from something that we've made in the past or thinking of an alternative way to attach the pieces so that the joints are movable.
Follow this link to find out more about muscles.
Something interesting to see
I wondered what the skeleton of a tortoise looked liked so I carried out a safe search online to find out. If you are interested in what I found out click here.