Today during BIology tuition, Mr Jaiganesh tought us about our body's respond during cold or hot temperature...
So... this is the extract... the funny part...
When we are cold, the hair folicle muscle will contracts and the fair folicle will be upright... Then,
Ben: Teacher, your hair folicle can erect ah?
Teacher: .......
Teacher: (teacher ignore Ben and continue his lesson) When hair folicles is upright, a layer of stil air is trapped and this prevent the heat from body to escape. Therefore, heat is conserve to maintain optimum body temperature...
Then teacher draw the arrow of heat release...
Teacher: eh, this is not steam you know! your hair folicles dont steam! this is heat!