Confusing Epiglottis

It was a good day. As usual entered the school at on time. Today, security checking at the gate. They checked by our ID card also. 4th hour 9N was the only hour already allotted to me. I had prepared to teach with interesting topic Digestion inside the mouth. 8D. second hour and 9H seventh hour were additional periods allotted. It was my second day in 8D. They invited me with happiness and love so I was very interested to teach them. In the fourth period of 9N, I taught the method of swallowing as port of digestion in mouth. The part epiglottis' made confusion among students. Because they learn about this pant for the first time. But when saw the ICT video showing mode of swallowing, the concept become clear