Year 4 get their muscles moving

In our Science lessons this week we began to investigate muscles in the human body. We found out that all bones have muscles connected to them; it is these muscles that move the bones. Did you know that muscles can pull but they cannot push? We discovered that muscles work in pairs and while one muscle is contracting (pulling), the other is relaxing. When we moved our arms up and down, we were able to feel our bicep and tricep muscles working. As we raised our lower arm, we felt our bicep muscle contracting (becoming shorter, fatter and harder) while our tricep muscle relaxed (becoming longer and thinner). If we lowered our forearm, the opposite was true.

We are now looking forward to designing our own science investigations related to bones and muscles in the coming weeks!