Simultaneous Swallowing and Breathing
Get a mouth full of saliva. Now try to swallow and breathe in at the same time.
A person cannot swallow and breathe at the same time. This is because a flap called
the epiglottis covers over the windpipe (trachea) when we swallow so that food does not
enter the lungs.
Hold Your Tongue
Put a small piece of soft food such as bread onto the middle of your tongue. Hold
the tip of your tongue with your fingers. Now swallow the food.
Because your tongue is needed to push the food to the back of your mouth, you will
be unable to swallow.
Investigation of Food Additives
Collect or copy labels showing ingredients on various foods. Refer to the table
below and library books to find the names of the additives, their functions and any
WHAT THE ADDITIVE DOES
||These make the food look more attractive to some people. Many
colours are natural, but some are artificial. It is mostly the artificial ones that have E
||E 100 - E 180
||These stop bacteria growing in food and turning it bad. Some
such as salt and alcohol have been known for a long time. The newer ones have E numbers.
||E 200 - E 290
||Air by itself can spoil food. Antioxidants stop or slow down
the reaction with oxygen that causes food spoilage in food such as butter.
||E 300 - E 321
||These chemicals stop separation of creamy liquids such as
mayonnaise made from oil and water.
||E 322 - E 494
||These sweeten food without using sugar.
||E 420 - E 421
||These thicken liquid food such as soup.
||E1400 - E1442