LO: To know that muscles, which are attached to the skeleton, help animals move parts of their body
-I can describe how joints in my skeleton enable movements
-I can understand that muscles work in antagonistic pairs
-I can investigate if people have stronger muscles because they use them more
Muscles enable us to move our bones, because they are attached to the ends of the bones and can shorten or lengthen. When muscles contract (shorten) they allow us to move, tell the chn that when any part of our body moves, muscles are in action! Muscles act in antagonistic pairs and can only pull; they cannot push. Often many muscles work together to have a single effect, e.g. it takes 17 muscles for humans to smile (with 17 antagonist muscles relaxing) & 43 to frown – so smile, it’s easier!! Ask chn to make various faces – anger, surprise, happiness – feel their face – which muscles are hard (contracted) and which are soft (relaxed)?
Human bodies have over 650 muscles and many different types of joints to allow our bodies to move in different ways. Take a look at http://insideout.rigb.org/insideout/anatomy/casing_the_joint/index.html to find out more about the hip, shoulder and knee joints. Ligaments and tendons at the ends of the muscles hold the bones together at the joints, while cartilage between the bones stops them from rubbing against each other. The different kinds of joints, pausing to allow chn to investigate the range of movement they have at each: Hinge (elbow, knee, fingers, etc) – like a door hinge; Saddle joints – base of thumb; Ball and Socket - hip, shoulder; Gliding joint – wrist.
Design a Poster explaining what the function of muscles is! Make sure you write about all the key functions.