Years 3 & 4 have been going more than skin-deep in Science this week as we find out about skeletons and muscles. We learned that both of these essential parts of our bodies offer support, protection and movement. As one child said, without a skeleton, “We’d just be a skin bag of flesh on the floor”. Quite an image, but true!
We spent Monday’s lesson identifying what a skeleton is and investigating which animals (including humans) are vertebrates (have a backbone) and which are invertebrates (don’t have a backbone).
We also looked at the difference between endoskeletons (skeletons on the inside – e.g. humans), exoskeletons (skeletons on the outside – e.g. crabs) and hydrostatic skeletons (fluid-filled compartments within an animal – e.g. octopuses).
We watched an octopus squeeze through seemingly-impossibly small spaces and a spider crab extricate itself from its exoskeleton in order to be able to grow.
On Thursday, we moved on to muscles, looking at how they cover and attach to the skeleton, how they work in pairs, where they are and what they are called.
We carried out a series of exercises and identified which muscle groups were working the hardest whilst we did them.
Next week we’ll be investigating whether there’s a link between amount of physical activity done and muscle strength.